Added missing phpdoc

framework/console/controllers/MessageController.php

@@ -640,6 +640,7 @@ EOD;
      * @param boolean $sort if translations should be sorted
      * @param string $category message category
      * @param boolean $markUnused if obsolete translations should be marked
+     * @return int exit code
      */
     protected function saveMessagesCategoryToPHP($messages, $fileName, $overwrite, $removeUnused, $sort, $category, $markUnused)
     {
@@ -650,7 +651,7 @@ EOD;
             ksort($existingMessages);
             if (array_keys($existingMessages) === $messages && (!$sort || array_keys($rawExistingMessages) === $messages)) {
                 $this->stdout("Nothing new in \"$category\" category... Nothing to save.\n\n", Console::FG_GREEN);
-                return;
+                return self::EXIT_CODE_NORMAL;
             }
             unset($rawExistingMessages);
             $merged = [];