small optimization

src/Silex/Application/TwigTrait.php

@@ -34,10 +34,6 @@ trait TwigTrait
      */
     public function render($view, array $parameters = array(), Response $response = null)
     {
-        if (null === $response) {
-            $response = new Response();
-        }
-
         $twig = $this['twig'];
 
         if ($response instanceof StreamedResponse) {
@@ -45,6 +41,9 @@ trait TwigTrait
                 $twig->display($view, $parameters);
             });
         } else {
+            if (null === $response) {
+                $response = new Response();
+            }
             $response->setContent($twig->render($view, $parameters));
         }