code: protected List<Serializable> getMessageArguments() {
  		List<Serializable> args = new ArrayList<>(1);
  		WLabel label = input.getLabel();
  
  		if (label == null) {
  			args.add("");
  		} else {
  			args.add(label.getText());
  		}
  
  		return args;
  	}
docs: Sub classes should remember to call super.getMessageArguments() to ensure that the field label is added to the
  list of arguments.
  
  @return The list of arguments to be applied to the validators error message.