ApiResource attributes default value to null

Author: soyuka

src/Annotation/AttributesHydratorTrait.php

@@ -37,7 +37,7 @@ trait AttributesHydratorTrait
     /**
      * @var array
      */
-    public $attributes = [];
+    public $attributes = null;
 
     /**
      * @throws InvalidArgumentException

src/Metadata/Resource/Factory/AnnotationResourceMetadataFactory.php

@@ -85,7 +85,7 @@ private function createMetadata(ApiResource $annotation, ResourceMetadata $paren
                 $annotation->iri,
                 $annotation->itemOperations,
                 $annotation->collectionOperations,
-                $annotation->attributes ?: null,
+                $annotation->attributes,
                 $annotation->subresourceOperations,
                 $annotation->graphql
             );