[Bug Report] el-tree 控件拖拽，在火狐浏览器下拖拽报错[Vue warn]: Error in event handler for "tree-node-drag-end": "TypeError: event.dataTransfer is null"
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.14
### OS/Browsers version
火狐浏览器
### Vue version
2.7.16
### Reproduction Link
### Steps to reproduce
在火狐浏览器执行拖拽
### What is Expected?
正常拖拽
### What is actually happening?
拖拽报错
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