FIX: when user did not fill his name, use email for content overview

app/Models/Content.php

@@ -177,7 +177,7 @@ class Content extends Model
         // join user email and user name to results when needed
         if ($joinAuthor) {
             $query = $query->join('users', 'users.id', '=', 'contents.user_id')
-                           ->addSelect('users.name AS author_name')
+                           ->addSelect('COALESCE(users.name, users.email) AS author_name')
                            ->addSelect('users.email AS author_email');
         }