[5.1] Followup convert mod_messages to service provider #42735 (#42906)

Author: heelc29

administrator/modules/mod_messages/src/Helper/MessagesHelper.php

@@ -49,10 +49,10 @@ public function getUnreadMessagesCount(Registry $params, AdministratorApplicatio
 
             return \count($messages);
         } catch (\RuntimeException $e) {
-            $messages = [];
-
             // Still render the error message from the Exception object
             $app->enqueueMessage($e->getMessage(), 'error');
+
+            return 0;
         }
     }
 }