Fix Group resource returning null twofaccounts_count

app/Api/v1/Resources/GroupResource.php

@@ -17,7 +17,7 @@ public function toArray($request)
         return [
             'id'                    => $this->id,
             'name'                  => $this->name,
-            'twofaccounts_count'    => $this->twofaccounts_count,
+            'twofaccounts_count'    => is_null($this->twofaccounts_count) ? 0 : $this->twofaccounts_count,
         ];
     }
 }