ElemeFE / ElemeFE/element

[Bug Report] 将 cascader 组件绑定的值 清空无法触发组件验证

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Dominant language
Vue
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Description

### Element UI version
2.15.9

### OS/Browsers version
window10

### Vue version
2.7.0-beta.8

### Reproduction Link
https://jsfiddle.net/yxswy/L3wykn48/1/

### Steps to reproduce
级联选择器在form 表单中 v-model 绑定的值手动设置为 ‘’ 或 数组,会被无视掉,只有在设置 undefined 的时候才有效果,但是再次赋值不会触发验证

### What is Expected?
手动设置为 空 或者空数组的时候能和下拉组件一样触发验证

### What is actually happening?
没有触发验证

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