selectTree使用treeData，添加showSearch，搜索没有的值，报js错误

[xuejiaomeng]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.5.1

Environment

vue 2.5.17 ,Chrome浏览器, mac

Reproduction link

Steps to reproduce

1.选择一个值
2.再到搜索框中输入 列表中没有的字段
3.点击任意地方，是输入框失去焦点，问题出现了 ：
Cannot read property 'domTreeNodes' of null
at VueComponent.eval (https://wvz9o.csb.app/node_modules/ant-design-vue/lib/vc-tree-select/src/Select.js:281:45)
4.Error in nextTick: "TypeError: Cannot read property 'domTreeNodes' of null", 未修复到，搜索没有的值之后，鼠标移开，使该组件失去焦点，再次点击下拉，还是会报上面的错，单选的情况，多选没有该问题

What is expected?

不报错

What is actually happening?

这个问题在1.4.*的版本是没有，1.5.0到1.5.3 都有这个问题

[xuejiaomeng]

Error in nextTick: "TypeError: Cannot read property 'domTreeNodes' of null", 未修复到，搜索没有的值之后，鼠标移开，使该组件失去焦点，再次点击下拉，还是会报上面的错

[xuejiaomeng]

if (!isMultiple && selectorValueList.length && open && _this2.popup&&_this2.popup.hasOwnProperty('domTreeNodes'))

[xuejiaomeng]

单选的情况，多选没有该问题

[github-actions]

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