[Bug Report] Cascader 级联选择器优化：children为[]时组件自动不显示下一级
Open
- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.12
### OS/Browsers version
所有
### Vue version
2.7.14
### Reproduction Link
https://codepen.io/pantt/pen/gOjPKJK?editors=1111
### Steps to reproduce
Cascader 级联选择器：当children为空数组[]时，组件会渲染一级显示暂无数据空区域
### What is Expected?
Cascader 级联选择器：当children为空数组[]时，组件自动 不渲染 暂无数据空区域
### What is actually happening?
Cascader 级联选择器：当children为空数组[]时，组件会渲染一级显示暂无数据空区域
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