MAPG-235 allow only logged in users to start a challenge

src/Controller/MapsController.php

@@ -48,6 +48,7 @@ class MapsController
         $user = $this->request->user();
         return new HtmlContent('maps', [
             'maps' => $maps,
+            'isLoggedIn' => $user !== null,
             'isAdmin' => $user !== null && $user->hasPermission(IUser::PERMISSION_ADMIN)
         ]);
     }