Log notice when no entry point is configured

Author: wouterj

Firewall/ExceptionListener.php

@@ -195,6 +195,10 @@ private function handleLogoutException(ExceptionEvent $event, LogoutException $e
     private function startAuthentication(Request $request, AuthenticationException $authException): Response
     {
         if (null === $this->authenticationEntryPoint) {
+            if (null !== $this->logger) {
+                $this->logger->notice(sprintf('No Authentication entry point configured, returning a %s HTTP response. Configure "entry_point" on the firewall ("{firewall_name}") if you want to modify the response.', Response::HTTP_UNAUTHORIZED), ['firewall_name' => $this->providerKey]);
+            }
+
             throw new HttpException(Response::HTTP_UNAUTHORIZED, $authException->getMessage(), $authException, [], $authException->getCode());
         }