og_ui: fix non-existing group test

og_ui/og_ui.module

@@ -1117,13 +1117,17 @@ function og_ui_get_group_admin($entity_type, $etid) {
   }
   // ensure we are invoking this on something worth doing it on
   $entity = entity_load_single($entity_type, $etid);
+  if (!$entity) {
+    // It is a non-existing group Id, giving up.
+    return FALSE;
+  }
   $entity_info = entity_get_info($entity_type);
   // if this isn't a group type, skip invoking admin modules
   if (empty($entity_info['entity keys']['bundle']) || !og_is_group_type($entity_type, $entity->{$entity_info['entity keys']['bundle']})) {
     $cache["$entity_type:$etid"] = FALSE;
     return FALSE;
   }
-  
+
 
   $data = module_invoke_all('og_ui_get_group_admin', $entity_type, $etid);
 

og_ui/og_ui.test

@@ -435,8 +435,12 @@ class OgUiManagePeopleTestCase extends DrupalWebTestCase {
     $this->drupalGet('entity_test/0x' . $this->entity->pid . '/group');
     $this->assertResponse(403);
     // Non-existing groups return 404 however.
-    $this->drupalGet('entity_test/666/group');
+    $this->drupalGet('entity_test/666');
     $this->assertResponse(404);
+    // For the same, admin area returns 403.
+    $this->drupalGet('entity_test/666/group');
+    $this->assertResponse(403);
+
   }
 }