code: function(res) {
        console.log('NO RESULTS');
        var MSG_NORESULT = this.conf.CONST.MSG_NORESULT;
        if (_.isArray(MSG_NORESULT)) {
          res.reply(_.sample(MSG_NORESULT));
        } else {
          res.reply(MSG_NORESULT);
        }
        return;
      }
docs: /*
  Called when no results to respond. Respond plain text
  conf.CONST.MSG_NORESULT to client by default.
  
  Now rolling message is supported. conf.CONST.MSG_NORESULT could be an
  array, _noresult() will choose one of them randomly. Even an object
  which represents a reply-with-pic is allowed to be in the array.
  
  *res*, will call res.reply() to respond to client.