[GitHub] [incubator-echarts] 100pah edited a comment on issue #12221: Cannot read property 'traverse' of undefined when drawing custom chart

[GitBox <gi...@apache.org>]

100pah edited a comment on issue #12221: Cannot read property 'traverse' of undefined when drawing custom chart
URL: https://github.com/apache/incubator-echarts/issues/12221#issuecomment-593645599
 
 
   The minimal `option` to reproduce this issue:
   
   ```js
   
   option = {
       yAxis: {
       },
       xAxis: {
       },
       series: [{
           type: 'custom',
           renderItem: function () {},     // the renderItem return nothing.
           progressiveThreshold: 1,       // Enable progressive when data item count > 1
           data: [[123, 456], [654, 321]] // data item count is 2
       }]
   };
   ````
   "`renderItem` is able to returns nothing" is a feature. It should be supported when progressive rendering enabled, rather than throw null pointer exception.
   The bug need to be fixed.

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