biu0w0 opened a new issue #10048: SVG 模式渲染有 NULL 值曲线，无法显示填充背景 URL: https://github.com/apache/incubator-echarts/issues/10048 ### Version 4.2.1-rc1 ### Reproduction link [https://codepen.io/anon/pen/zbKJJE?editors=0010](https://codepen.io/anon/pen/zbKJJE?editors=0010) ### Steps to reproduce 1/ 使用 SVG 渲染模式； 2/ 输入 Line 型数据，并为曲线设置 areaStyle.color； 3/ 将数据第 1 个值改为 null 或 "-"； 4/ 此时曲线填充背景消失。 ### What is expected? SVG 模式下，应兼容有 NULL 值曲线。 ### What is actually happening? SVG 模式下，NULL 值会影响曲线填充渲染。 --- 1/ 曲线数据中第一个值为 null，则曲线背景完全消失； 2/ 曲线非首值为 null 时，可以看到曲线背景，但 console 有报错。 <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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