legend scroll 失效echarts 柱状配置项内容和展示

当legend里面有''（空字符串）的话，箭头无法点击

      option = {
    title: {
        text: '医保/非医保人次',
        right: 'center'
    },
    toolbox: {
        feature: {
            dataView: {
                show: true,
                readOnly: false
            },
            saveAsImage: {
                show: true,
                backgroundColor: '#ffffff'
            },
            magicType: {
                type: ['stack', 'tiled']
            },
            restore: {}
        }
    },
    legend: {
        data: ['', '三八节八折优惠', '企业离休', '体检', '公益医保', '其他', '市居民医保', '市直离休', '市直离休(社区)', '市职工医保', '市领导', '市领导.', '政府门诊', '新农合', '淇河门诊', '科室备药', '铁路医保', '鹤翔门诊', '黎阳门诊', '其他(免费)', '富士康门诊', '贫困精神人', '归侨(门诊)', '归侨直系亲属(住院)', '归侨直系亲属(门诊)'],
        type: 'scroll',
        top: '8%'
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'shadow'
        }
    },
    grid: {
        top: '20%',
        left: '5%',
        right: '4%',
        bottom: '12%',
        containLabel: true
    },
    xAxis: [{
        type: 'category',
        axisLine: {
            lineStyle: {
                color: '#000'
            }
        },
        data: ['2013', '2014', '2015'],
        axisLabel: {
            interval: 0,
            rotate: 50,
            textStyle: {
                color: '#000'
            }
        }
    }],
    yAxis: [{
        name: '',
        type: 'value',
        axisLine: {
            lineStyle: {
                color: '#000'
            }
        },
        axisLabel: {
            textStyle: {
                color: '#000'
            },
            formatter: function(value) {
                if (value >= 100000000) {
                    return value / 100000000 + ' 亿'
                } else if (value >= 1000000) {
                    return value / 10000 + ' 万'
                } else {
                    return value + ''
                }
            },
        }
    }],
    dataZoom: [{
        show: true,
        height: 30,
        bottom: 10,
        start: 0,
        end: 100,
        handleSize: '110%',
    }, {
        type: 'inside'
    }],
    series: [{
        name: '未填',
        type: 'bar',
        data: [25284, 32682, 22137],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '三八节八折优惠',
        type: 'bar',
        data: [2, 0, 0],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '企业离休',
        type: 'bar',
        data: [727, 542, 283],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '体检',
        type: 'bar',
        data: [66, 304, 19],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '公益医保',
        type: 'bar',
        data: [17, 10, 0],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '其他',
        type: 'bar',
        data: [198283, 287583, 206637],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市居民医保',
        type: 'bar',
        data: [271, 314, 419],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市直离休',
        type: 'bar',
        data: [674, 760, 981],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市直离休(社区)',
        type: 'bar',
        data: [477, 296, 0],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市职工医保',
        type: 'bar',
        data: [60348, 65452, 50920],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市领导',
        type: 'bar',
        data: [931, 1217, 905],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '市领导.',
        type: 'bar',
        data: [1004, 971, 658],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '政府门诊',
        type: 'bar',
        data: [12, 9, 1],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '新农合',
        type: 'bar',
        data: [1, 0, 1],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '淇河门诊',
        type: 'bar',
        data: [48, 9, 4],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '科室备药',
        type: 'bar',
        data: [235, 344, 352],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '铁路医保',
        type: 'bar',
        data: [254, 268, 37],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '鹤翔门诊',
        type: 'bar',
        data: [104, 118, 142],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '黎阳门诊',
        type: 'bar',
        data: [19, 13, 3],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '其他(免费)',
        type: 'bar',
        data: [0, 1, 0],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '富士康门诊',
        type: 'bar',
        data: [0, 114, 58],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '贫困精神人',
        type: 'bar',
        data: [0, 206, 153],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '归侨(门诊)',
        type: 'bar',
        data: [0, 0, 1],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '归侨直系亲属(住院)',
        type: 'bar',
        data: [0, 0, 1],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }, {
        name: '归侨直系亲属(门诊)',
        type: 'bar',
        data: [0, 0, 9],
        itemStyle: {
            normal: {
                color: ''
            }
        },
        label: {
            normal: {
                show: true,
                position: 'top'
            }
        },
        barWidth: ''
    }]
};