[FrameworkBundle] Allow any 2xx response code in a subrequest

src/Symfony/Bundle/FrameworkBundle/HttpKernel.php

@@ -130,7 +130,7 @@ class HttpKernel extends BaseHttpKernel
         try {
             $response = $this->handle($subRequest, HttpKernelInterface::SUB_REQUEST, true);
 
-            if (200 != $response->getStatusCode()) {
+            if (!$response->isSuccessful()) {
                 throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).', $request->getUri(), $response->getStatusCode()));
             }