feat: 修复列表树搜索后无法收起展开问题(#807) (#913)

Author: dingqianwen

src/pages/list/tree/index.vue

@@ -35,6 +35,10 @@ const filterText = ref();
 const expanded = ['0', '0-0', '0-1', '0-2', '0-3', '0-4'];
 
 const onInput = () => {
+  if (!filterText.value) {
+    filterByText.value = null;
+    return;
+  }
   filterByText.value = (node: TreeNodeModel) => {
     return node.label.includes(filterText.value);
   };