Now a more correct `201 - No content` code returned as response if OK

avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarResource.java

@@ -78,7 +78,7 @@ public class AvatarResource extends AbstractAvatarResource {
                 }
                 response = Response.seeOther(uriBuilder.build(auth.getSession().getRealm().getName())).build();
             } else {
-                response = Response.ok().build();
+                response = Response.noContent().build();
             }
         } catch (Exception ex) {
             response = Response.serverError().build();