履歴画面変更（#308） (#315)

Merge branch 'main' into feature/308

#308

#308

#308

#308

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #315

frontend/src/components/PostEditForm.tsx

@@ -62,7 +62,7 @@ export default (({ post, onSave }: Props) => {
 	  <Label>タイトル</Label>
 	  <input type="text"
 		 className="w-full border rounded p-2"
-		 value={title}
+		 value={title ?? ''}
 		 onChange={ev => setTitle (ev.target.value)}/>
 	</div>