Fix Announce/Delete AP deliver (#7517)

* Fix Announce/Delete AP deliver

* Revert "Fix Announce/Delete AP deliver"

This reverts commit 0292c5196df48f67bb7914e925560ba69e2b2980.

* localOnlyのDeleteをdeliverしないように

* null Activityに対するUndoはdeliverしないように

src/remote/activitypub/renderer/undo.ts

@@ -1,8 +1,12 @@
 import config from '@/config';
 import { ILocalUser, User } from '../../../models/entities/user';
 
-export default (object: any, user: { id: User['id'] }) => ({
-	type: 'Undo',
-	actor: `${config.url}/users/${user.id}`,
-	object
-});
+export default (object: any, user: { id: User['id'] }) => {
+	if (object == null) return null;
+
+	return {
+		type: 'Undo',
+		actor: `${config.url}/users/${user.id}`,
+		object
+	};
+};