feature #15953 [TwigBridge] is_granted no longer raise an exception if the token storage is empty (lyrixx)

This PR was merged into the 2.8 branch.

Discussion
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[TwigBridge] is_granted no longer raise an exception if the token storage is empty

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10159
| License       | MIT
| Doc PR        |

Commits
-------

6be68fd [TwigBridge] is_granted no longer raise an exception if the token storage is empty

src/Symfony/Bridge/Twig/Extension/SecurityExtension.php

@@ -13,6 +13,7 @@ namespace Symfony\Bridge\Twig\Extension;
 
 use Symfony\Component\Security\Acl\Voter\FieldVote;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
 
 /**
  * SecurityExtension exposes security context features.
@@ -38,7 +39,11 @@ class SecurityExtension extends \Twig_Extension
             $object = new FieldVote($object, $field);
         }
 
-        return $this->securityChecker->isGranted($role, $object);
+        try {
+            return $this->securityChecker->isGranted($role, $object);
+        } catch (AuthenticationCredentialsNotFoundException $e) {
+            return false;
+        }
     }
 
     /**