add user_id column to query, fixes #1194

Closes #1194

Merge request studip/studip!708

lib/classes/ForumEntry.php

@@ -1242,12 +1242,11 @@ class ForumEntry  implements PrivacyObject
         $stmt->execute([$seminar_id, $seminar_id]);
         if ($stmt->fetchColumn() == 0) {
             $stmt = DBManager::get()->prepare("INSERT INTO forum_entries
-                (topic_id, seminar_id, name, mkdate, chdate, lft, rgt, depth)
-                VALUES (?, ?, 'Übersicht', UNIX_TIMESTAMP(), UNIX_TIMESTAMP(), 0, 1, 0)");
+                (topic_id, seminar_id, user_id, name, mkdate, chdate, lft, rgt, depth)
+                VALUES (?, ?, '', 'Übersicht', UNIX_TIMESTAMP(), UNIX_TIMESTAMP(), 0, 1, 0)");
             $stmt->execute([$seminar_id, $seminar_id]);
         }
 
-
         // make sure, that the category "Allgemein" exists
         $stmt = DBManager::get()->prepare("INSERT IGNORE INTO forum_categories
             (category_id, seminar_id, entry_name) VALUES (?, ?, ?)");