Fix resource normalizer to set content and download URL only for AbstractResource

src/CoreBundle/Serializer/ResourceNormalizer.php

@@ -77,11 +77,10 @@ final class ResourceNormalizer implements ContextAwareNormalizerInterface, Norma
             // Get all links from resource.
             if ($object instanceof AbstractResource) {
                 $object->setResourceLinkListFromEntity();
-            }
-            // }
-
                 $object->contentUrl = $this->generator->generate('chamilo_core_resource_view', $params);
                 $object->downloadUrl = $this->generator->generate('chamilo_core_resource_download', $params);
+            }
+            // }
 
             // Get illustration of a resource, instead of looking for the node children to get the illustration.
             if ($object instanceof ResourceIllustrationInterface) {