code: @Override
  	protected boolean isPresent(final Request request) {
  		if (isAllowNoSelection()) {
  			String id = getId();
  			return request.getParameter(id + "-h") != null;
  		} else {
  			return super.isPresent(request);
  		}
  	}
docs: <p>
  Indicates whether this list was present in the request.
  </p>
  <p>
  Lists that allow no option to be selected have a hidden input field, whose name is name-h to indicate that it is
  in the request.
  </p>
  
  @param request the request being responded to.
  @return true if this list was present in the request, false if not.