Revert "fix(TreeSelect): should not render empty nav (#4663)"

This reverts commit a18a9c5701.

src/tree-select/index.tsx

@@ -56,9 +56,7 @@ function TreeSelect(
       : activeId === id;
   }
 
-  const Navs = items
-    .filter(item => item.text)
-    .map(item => (
+  const Navs = items.map(item => (
     <SidebarItem
       dot={item.dot}
       info={item.info}