ihuangxinyu opened a new issue #11310: 标题title渲染了两遍, legend.data和series均为空数组时， URL: https://github.com/apache/incubator-echarts/issues/11310 ### Version 4.3.0 ### Steps to reproduce 1.watch 数据集变化，然后执行渲染图表的repain函数， 2.repain函数里，初始化chart，填充option，然后setOption(option, true) 3.当option里， lengend.data=[], series=[]，即二者同时为空数组时，标题渲染了两遍，如下图  4.当我把series设为 [[]] 或者 {} 时，标题恢复正常的一遍，然而，控制台此时报错series.type需要指定类型, 如下图  5.当我把series设为 [[{type:"line"}]] 和 {type: 'line'} ,此两种情况不再类型报错，但是导致标题渲染两遍 6.总结： ——legend=[], series = [] || [[{ type: 'line'} ]] || { type: 'line' } : 标题渲染两遍， 不报类型错误 ——legend=[], series = [[]] || {} ：标题正常，报类型错误 7. 在Chrome和Safari最新版上都有重现。 两遍标题和类型错误都无法在gallery重现。 ### What is expected? 不报类型错误，标题正常渲染 ### What is actually happening? 二者出其一 --- 希望得到legend和series都为空时候的处理方法 <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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