Check maintenance mode before loading apps in route matcher

lib/base.php

@@ -596,7 +596,9 @@ class OC {
 
 		if (!self::$CLI) {
 			try {
+				if (!OC_Config::getValue('maintenance', false)) {
 					OC_App::loadApps();
+				}
 				OC::getRouter()->match(OC_Request::getRawPathInfo());
 				return;
 			} catch (Symfony\Component\Routing\Exception\ResourceNotFoundException $e) {