[Bug Report] table tree某个节点的row-key值为0时，无法展开收起
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.13.1
### OS/Browsers version
win10 chrome81.0.4044.129
### Vue version
2.6.2
### Reproduction Link
https://codepen.io/winnerdudu/pen/yLYqMre
### Steps to reproduce
表格第二行的id为0，无法展开收起
### What is Expected?
正确展开收起
### What is actually happening?
无法展开收起
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