code: public ModelNode getConnector(String name) throws Exception {
          final Address address = Address.root().add(SUBSYSTEM, SUBSYSTEM_WEB, CONNECTOR, name);
          return readResource(address, true);
      }
docs: Returns the connector node with all its attributes. Will be null if it doesn't exist.
  
  @param name the name of the connector whose node is to be returned
  @return the node if there is a connector with the given name already in existence, null otherwise
  @throws Exception any error