ドキュメントが見つからなくてもエラーにせずnullを返すように

src/models/user.ts

@@ -3,7 +3,7 @@ const deepcopy = require('deepcopy');
 const sequential = require('promise-sequential');
 import rap from '@prezzemolo/rap';
 import db from '../db/mongodb';
-import Note, { pack as packNote, deleteNote } from './note';
+import Note, { packMany as packNoteMany, deleteNote } from './note';
 import Following, { deleteFollowing } from './following';
 import Mute, { deleteMute } from './mute';
 import { getFriendIds } from '../server/api/common/get-friends';
@@ -361,9 +361,11 @@ export const pack = (
 		_user = deepcopy(user);
 	}
 
-	// TODO: ここでエラーにするのではなくダミーのユーザーデータを返す
-	// SEE: https://github.com/syuilo/misskey/issues/1432
-	if (!_user) return reject('invalid user arg.');
+	// ユーザーがデータベース上に見つからなかったとき
+	if (_user == null) {
+		console.warn(`user not found on database: ${user}`);
+		return null;
+	}
 
 	// Me
 	const meId: mongo.ObjectID = me
@@ -468,9 +470,9 @@ export const pack = (
 	if (opts.detail) {
 		if (_user.pinnedNoteIds) {
 			// Populate pinned notes
-			_user.pinnedNotes = Promise.all(_user.pinnedNoteIds.map((id: mongo.ObjectId) => packNote(id, meId, {
+			_user.pinnedNotes = packNoteMany(_user.pinnedNoteIds, meId, {
 				detail: true
-			})));
+			});
 		}
 
 		if (meId && !meId.equals(_user.id)) {