Revert "fix(components): [table] render default slot only when it returns valid vnodes (#21651)" (#21728)

* revert: revert fix table slot rendering (#21651)

* Revert "fix(components): [table] render default slot only when it returns valid vnodes (#21651)"

This reverts commit 6bf6313f35.

---------

Co-authored-by: dopamine <coderzyou@gmail.com>

packages/components/table/src/table-column/render-helper.ts

@@ -1,4 +1,5 @@
 import {
+  Comment,
   computed,
   getCurrentInstance,
   h,
@@ -7,12 +8,7 @@ import {
   unref,
   watchEffect,
 } from 'vue'
-import {
-  debugWarn,
-  ensureValidVNode,
-  isArray,
-  isUndefined,
-} from '@element-plus/utils'
+import { debugWarn, isArray, isUndefined } from '@element-plus/utils'
 import { useNamespace } from '@element-plus/hooks'
 import {
   cellForced,
@@ -164,7 +160,9 @@ function useRender<T extends DefaultRow>(
         let children: VNode | VNode[] | null = null
         if (slots.default) {
           const vnodes = slots.default(data)
-          children = ensureValidVNode(vnodes) ? vnodes : originRenderCell(data)
+          children = vnodes.some((v) => v.type !== Comment)
+            ? vnodes
+            : originRenderCell(data)
         } else {
           children = originRenderCell(data)
         }

packages/utils/vue/vnode.ts

@@ -170,21 +170,3 @@ export const flattedChildren = (
   })
   return result
 }
-
-// Copyied from https://github.com/vuejs/core/blob/c875019d49b4c36a88d929ccadc31ad414747c7b/packages/runtime-core/src/helpers/renderSlot.ts#L102
-export function ensureValidVNode(
-  vnodes: VNodeArrayChildren
-): VNodeArrayChildren | null {
-  return vnodes.some((child) => {
-    if (!isVNode(child)) return true
-    if (child.type === Comment) return false
-    if (
-      child.type === Fragment &&
-      !ensureValidVNode(child.children as VNodeArrayChildren)
-    )
-      return false
-    return true
-  })
-    ? vnodes
-    : null
-}