get entity_type_id from route

Author: DiDebru

src/Controller/OgAdminRoutesController.php

@@ -55,16 +55,15 @@ public static function create(ContainerInterface $container) {
    *   List of available admin routes for the current group.
    */
   public function overview(RouteMatchInterface $route_match) {
+    $entity_type_id = $route_match->getRouteObject()->getOption('_og_entiy_type_id');
     /** @var \Drupal\Core\Entity\EntityInterface $group */
-    $group = $route_match->getParameter('group');
-    if (!is_object($group)) {
-      return;
-    }
+    $group = $route_match->getParameter($entity_type_id ?: 'group');
+
     // Get list from routes.
     $content = [];
 
     $route_name = "og_admin.members";
-    $parameters = ['entity_type_id' => $group->getEntityTypeId(), 'group' => $group->id()];
+    $parameters = ['entity_type_id' => $group->getEntityTypeId() ?: $entity_type_id, 'group' => $group->id()];
 
     // We don't use Url::fromRoute() here for the access check, as it will
     // prevent us from unit testing this method.