added check on root-vo scope in the update case

src/main/java/org/gcube/informationsystem/publisher/RegistryPublisherImpl.java

@@ -237,7 +237,13 @@ public class RegistryPublisherImpl implements RegistryPublisher {
 				ScopeProvider.instance.set(currentVO);
 				registryUpdate(resource, 0);
 				vosScopes.remove(currentVO);
+	// in this case it is a root-vo scope so we need to update the resource only at root-vo level	
+			}else{
+				RegistryStub stub = getRegistryStub();
+			 	createResource(resource, currentVO, stub);
+			 	return resource;
 			}
+
 			int tries=0;
 			for (String voScope: vosScopes){
 				log.debug("[VOUPDATE] check update operation on scope {} ",voScope);