code: function MnListDiffMessage(arg, options) {
    Message.call(this, options);
    this.MnListDiff = options.MnListDiff;
    this.command = 'mnlistdiff';
    $.checkArgument(
      _.isUndefined(arg) || arg instanceof this.MnListDiff,
      'An instance of MnListDiff or undefined is expected'
    );
    this.mnlistdiff = arg;
  }
docs: Contains information about a MnListDiff
  @param {MnListDiff} arg - An instance of MnListDiff
  @param {Object=} options
  @param {Function} options.MnListDiff - a MnListDiff constructor
  @extends Message
  @constructor