Merge branch '4.4' into 5.4

* 4.4:
  Added  Urdu Language Translation in Form Component, Security Core and in Validator Component
  Merge upgrade notes for Serializer component
  Throw LogicException instead of Error when trying to generate logout-URL without request

Author: fabpot

Logout/LogoutUrlGenerator.php

@@ -101,6 +101,10 @@ private function generateLogoutUrl(?string $key, int $referenceType): string
 
             $request = $this->requestStack->getCurrentRequest();
 
+            if (!$request) {
+                throw new \LogicException('Unable to generate the logout URL without a Request.');
+            }
+
             $url = UrlGeneratorInterface::ABSOLUTE_URL === $referenceType ? $request->getUriForPath($logoutPath) : $request->getBaseUrl().$logoutPath;
 
             if (!empty($parameters)) {