FIX: allow menu registration only for logged user

This funcionality should be acomplished using "auth" middleware, however I am not sure if order of middlewares matter. For this case I have added one if to this middleware.

app/Http/Middleware/AdminMenuRegistrator.php

@@ -16,12 +16,16 @@ class AdminMenuRegistrator
      */
     public function handle($request, Closure $next)
     {
+        // register menu only of logged users
+        if (!\Auth::check()) {
+            return;
+        }
+
         $modules = \Module::enabled();
 
         // iterate over all enabled modules
         foreach ($modules as $key => $module) {
             $handler = config($module->getName() . '.handler');
-
             // try to register menus
             call_user_func([$handler, 'registerAdminMenu'], \Auth::user());
         }