Unlogged "me" query now returns null.

Until now, the unloggued query was actually returning a user whose name was "anon.".
This originates from a weird behaviour of Symfony.
"me" should return null if noone is logged.

Note this is a potential breaking change for clients implementing the "me" query, but since no one complained about the current behaviour that makes no sense, I'll assume this feature is not used wildly yet.

If this PR introduce breaking changes in your code, please notify me.

Author: moufmouf

Controller/GraphQL/MeController.php

@@ -41,9 +41,8 @@ public function me(): ?UserInterface
         $user = $token->getUser();
 
         if (!$user instanceof UserInterface) {
-            // getUser() can be an object with a toString or a string
-            $userName = (string) $user;
-            $user = new BasicUser($userName);
+            // getUser() can be the "anon." string.
+            return null;
         }
 
         return $user;

Tests/FunctionalTest.php

@@ -290,10 +290,7 @@ public function testMeQuery(): void
 
         $this->assertSame([
             'data' => [
-                'me' => [
-                    'userName' => 'anon.',
-                    'roles' => [],
-                ]
+                'me' => null
             ]
         ], $result);