refs #97 Fixed display placeholder for post preview

Author: tabuna

app/Http/Controllers/PostController.php

@@ -76,8 +76,8 @@ public function show(Post $post)
     public function preview(Request $request)
     {
         return turbo_stream()->replace('post-preview', view('post.preview', [
-            'title'   => $request->input('title', 'Заголовок'),
-            'content' => $request->input('content', 'Текст публикации'),
+            'title'   => $request->input('title') ?? 'Заголовок',
+            'content' => $request->input('content') ?? 'Текст публикации',
         ]));
     }