fix(state): delete with stateOptions and object mapper (#7615)

fixes #7612

Author: soyuka

src/State/Processor/ObjectMapperProcessor.php

@@ -56,6 +56,11 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
             $context,
         );
 
+        // in some cases (delete operation), the decoration may return a null object
+        if (null === $persisted) {
+            return $persisted;
+        }
+
         $request?->attributes->set('persisted_data', $persisted);
 
         // return the Resource representation of the persisted entity

tests/Functional/MappingTest.php

@@ -95,6 +95,9 @@ public function testShouldMapBetweenResourceAndEntity(): void
 
         $r = self::createClient()->request('PATCH', $uri, ['json' => ['username' => 'ba zar'], 'headers' => ['content-type' => 'application/merge-patch+json']]);
         $this->assertJsonContains(['username' => 'ba zar']);
+
+        $r = self::createClient()->request('DELETE', $uri);
+        $this->assertResponseStatusCodeSame(204);
     }
 
     public function testShouldMapToTheCorrectResource(): void