docs: public String user(String property) {
  
          if (isNotInitialized()) {
              return getMessage(NOT_INITIALIZED);
          }
          try {
              return CmsJspTagUser.userTagAction(property, getRequest());
          } catch (Throwable t) {
              handleException(t);
          }
          CmsMessageContainer msgContainer = Messages.get().container(Messages.GUI_ERR_USER_PROP_READ_1, property);
          return getMessage(msgContainer);
      }