axias scale bugecharts 配置项内容和展示

使用scale时有些数据情况下某个柱会不显示

      option = {
    legend: {},
    tooltip: {},
    dataset: {
        source: [
            ['product', '2015'],
            ['Matcha Latte', 4],
            ['Milk Tea', 6],
            ['Cheese Cocoa', 7],
            ['Walnut Brownie', 8],
            ['Walnut Browniea', 9]
        ]
    },
    xAxis: {type: 'category'},
    yAxis: {scale:true},
    // Declare several bar series, each will be mapped
    // to a column of dataset.source by default.
    series: [
        {type: 'bar'},
    ]
};