cl-select 点了删除后，没有传递null，导致移不出到顶级

[Wanger]

{
label: "选择上级分类",
prop: "parentId",
component: {
name: "cl-select",
props: {
tree: true,
current: true,
labelKey: "name",
valueKey: "id",
checkStrictly: false,
},
},
},

[Wanger]

我的解决办法
src/plugins/crud/components/select/index.tsx

  function getValue(val: any): any | any[] {
+      if (val === undefined) return null;

       if (props.allLevelsId) {