[BUGFIX] Return empty array to match type hint but still skip the service

Author: vertexvaar

Classes/UserRepository.php

@@ -81,8 +81,7 @@ public function __construct()
     public function processUserRow(array $foreignUserRow): array
     {
         if (!isset($foreignUserRow['username'])) {
-            // TODO: replace this invalid return with an exception
-            return false;
+            return [];
         }
 
         $foreignUserRow = $this->filterForeignUserRowByLocalFields($foreignUserRow);