[Bug Report] When the El-cascade componet options changes the console print : Error in callback for watcher "options": "TypeError: Cannot read property 'level' of null"
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- Dominant language
- Vue
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Description
### Element UI version
2.11.1
### OS/Browsers version
Windows 7 professional 64bit Service pack 1/Chome 62.0.3202.94
### Vue version
2.6.10
### Reproduction Link
https://codepen.io/shadesonng/pen/VodXRr
### Steps to reproduce
click the button of "change options", the console print:Error in callback for watcher "options": "TypeError: Cannot read property 'level' of null"
### What is Expected?
the console print no error
### What is actually happening?
the console print error
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