[GitHub] [incubator-echarts] zhangyunihao opened issue #9054: label后面的inlineHeight属性必须在有rich字段情况下才生效

[GitHub]

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### One-line summary [问题简述]
label后面的inlineHeight属性必须在有rich字段下才生效




### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: 4.1.0
+ Browser version [浏览器类型和版本]: chrome
+ OS Version [操作系统类型和版本]: win10





### Expected behaviour [期望结果]

inlineHeight生效



### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
        tooltip: {
          trigger: 'item',
          formatter: '{b}'
        },
        series: [
          {
            name: this.className,
            type: 'pie',
            radius: ['40%', '70%'],
            avoidLabelOverlap: false,
            label: {
              formatter: '{a}',
              show: true,
              position: 'center',
              fontSize: '16',
              fontFamily: 'PingFangSC-Regular',
              lineHeight: 30,
              // ！！！！！！为了使lineHeight生效，下面这行必须加
              rich: {}
            },

            center: ['50%', '38%'],
            data: this.chartData

          }
        ]
}

```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
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[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9054 ]
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