y轴类型为log时，启用visualMap出现异常

[stoneshu123]

One-line summary [问题简述]

y轴类型为log时，启用visualMap出现如下异常：
Failed to execute 'createLinearGradient' on 'CanvasRenderingContext2D': The provided double value is non-finite.

Version & Environment [版本及环境]

• ECharts version [ECharts 版本]:
• Browser version [浏览器类型和版本]:
• OS Version [操作系统类型和版本]:

Expected behaviour [期望结果]

ECharts option [ECharts配置项]

option = {
        title: {
            text: 'Beijing AQI'
        },
        tooltip: {
            trigger: 'axis'
        },
        xAxis: {
            data: data.map(function (item) {
                return item[0];
            })
        },
        yAxis: {
            type:'log',
            splitLine: {
                show: false
            }
        },
        toolbox: {
            left: 'center',
            feature: {
                dataZoom: {
                    yAxisIndex: 'none'
                },
                restore: {},
                saveAsImage: {}
            }
        },
        dataZoom: [{
            startValue: '2014-06-01'
        }, {
            type: 'inside'
        }],
        visualMap: {
            top: 10,
            right: 10,
            pieces: [{
                gt: 0,
                lte: 50,
                color: '#096'
            }, {
                gt: 50,
                lte: 100,
                color: '#ffde33'
            }, {
                gt: 100,
                lte: 150,
                color: '#ff9933'
            }, {
                gt: 150,
                lte: 200,
                color: '#cc0033'
            }, {
                gt: 200,
                lte: 300,
                color: '#660099'
            }, {
                gt: 300,
                color: '#7e0023'
            }],
            outOfRange: {
                color: '#999'
            }
        },
        series: {
            name: 'Beijing AQI',
            type: 'line',
            data: data.map(function (item) {
                return item[1];
            }),
            markLine: {
                silent: true,
                data: [{
                    yAxis: 50
                }, {
                    yAxis: 100
                }, {
                    yAxis: 150
                }, {
                    yAxis: 200
                }, {
                    yAxis: 300
                }]
            }
        }
}

Other comments [其他信息]

[luowengang]

请问谁清楚， 该问题是否已经在新版本中解决？

[luowengang]

请echarts开发负责人员能够关注，尽快解决该问题，谢谢

[stale]

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