### Version 5.0.2 ### Steps to reproduce  没有判断null用typeof判断也是object的情况, 导致我的ecahrts包升级到v5之后就报错了,这种判断类型的方法还是封装一下吧 ### What is expected? 希望代码执行不会再报错 ### What is actually happening? 代码执行报错了 <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE --> <!-- This issue is in English. DO NOT REMOVE -->