bug symfony#38391 [Security] Fixed undefined property in Firewall\ExceptionListener (yceruto)

This PR was merged into the 5.2-dev branch.

Discussion
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[Security] Fixed undefined property in Firewall\ExceptionListener

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

When there is no entry point configuration:
```
Notice: Undefined property:
Symfony\Component\Security\Http\Firewall\ExceptionListener::$providerKey
```

/cc @wouterj

Commits
-------

3d83f94 Fixed undefined property in Firewall\ExceptionListener

Author: fabpot

src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php

@@ -196,7 +196,7 @@ private function startAuthentication(Request $request, AuthenticationException $
     {
         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]);
+                $this->logger->notice(sprintf('No Authentication entry point configured, returning a %s HTTP response. Configure "entry_point" on the firewall "%s" if you want to modify the response.', Response::HTTP_UNAUTHORIZED, $this->firewallName));
             }
 
             throw new HttpException(Response::HTTP_UNAUTHORIZED, $authException->getMessage(), $authException, [], $authException->getCode());