雷达图怎么修改图例颜色？echarts radar配置项内容和展示

这个是一个16等份的雷达图，K8-K1之间都有一个隐藏的轴线。 问题1：如果K8与K7之间的数据为空，K1-K8雷达图生成的时候出不来，只能鼠标移到图例才能出现。 问题2：怎么修改雷达图连线的颜色，也就是图例中的红色线怎么修改？

      option = {
    title: {
        text: '个人能力雷达图'
    },
    legend:{
      data: [{
                name:'K1-K8',
                icon:'rect'
                
            },{
                name:'能力级别',
                borderColor:'#CCC'
            }
        ],
        borderColor :'#FFF'
    },
    color: ['red', 'green'],
    radar: {
        shape: 'circle',
        splitNumber:3,
        interval: 0,
        indicator: [
           { name: 'K8', max: 30,axisLabel:{show:true}},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K7', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K6', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K5', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K4', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K3', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K2', max: 30},
           { name: '', max: 30,axisLine:{show:false}},
           { name: 'K1', max: 30},
           { name: '', max: 30,axisLine:{show:false}}
        ],
        splitArea:{
            areaStyle:{
                color:['#FFF','#FFF','#FFF'],
                shadowColor: 'rgba(0, 0, 0, 0.3)',
                shadowBlur: 1
                
            }
        },
        splitLine:{
            lineStyle:{
                color: ['#aaa', '#ddd']
            }
        }
    },
    series: [{
        name: 'K1-K8',
        type: 'radar',
        data : [
            {
                value : [13.0,,19.0,,19.0,,19.0,,19.0,,17.0,,26.0,,25.0,],
                name : 'K1-K8',
                symbol: 'rect',
                symbolSize: 1,
                areaStyle: {
                    normal: {
                        color: 'rgb(167,199,101)'
                    }
                },
                lineStyle: {normal: {color:'rgb(167,199,101)',width:1}}//折线样式
            },
            {
                value : [0,0,17.0,0,0,0,0,0,18.33,0,0,0,0,25.5,0],
                name:'能力级别'
            }
        ]
    }]
};