/**
  * Call the given controller instance method.
  *
  * @param  \Nova\Routing\Controller  $instance
  * @param  \Nova\Routing\Route  $route
  * @param  string  $method
  * @return mixed
  */
 protected function call($instance, $route, $method)
 {
     $parameters = $route->parametersWithoutNulls();
     return $instance->callAction($method, $parameters);
 }