feat(runtime): support rendering comment nodes

packages/runtime-core/src/componentRenderUtils.ts

@@ -3,7 +3,7 @@ import {
   FunctionalComponent,
   Data
 } from './component'
-import { VNode, normalizeVNode, createVNode, Empty } from './vnode'
+import { VNode, normalizeVNode, createVNode, Comment } from './vnode'
 import { ShapeFlags } from './shapeFlags'
 import { handleError, ErrorCodes } from './errorHandling'
 import { PatchFlags } from './patchFlags'
@@ -45,7 +45,7 @@ export function renderComponentRoot(
     }
   } catch (err) {
     handleError(err, instance, ErrorCodes.RENDER_FUNCTION)
-    result = createVNode(Empty)
+    result = createVNode(Comment)
   }
   currentRenderingInstance = null
   return result