ElemeFE / ElemeFE/element

[bug report] using cascade to report "cannot read property 'level' of null" error in dialog

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Description

### Element UI version
2.15.1

### OS/Browsers version
chrome 88.0.4324.182

### Vue version
2.6.10

### Reproduction Link
https://codepen.io/master-huang/pen/JjEEeOO

### Steps to reproduce
1、打开控制板 console页面
2、点击dialog 打开弹窗
3、关闭弹窗
4、报错

### What is Expected?
正常无报错

### What is actually happening?
我们的场景是:
有个数据列表,每条数据都可以编辑操作,每条数据选中的内容和级别联动的选项都不同,当编辑第一条时,回显数据没问题,然后关闭弹窗,就会报错,再点击其他的数据编辑,弹窗正常,但是数据不能正常回显

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