Index file is empty

[colossus9]

While installing the hubot-freshdesk module using npm (for usage with a hubot), the following error is returned when the hubot is started:

[Sat Nov 12 2016 21:41:51 GMT+0000 (UTC)] DEBUG Loading external-scripts from npm packages
[Sat Nov 12 2016 21:41:51 GMT+0000 (UTC)] ERROR Error loading scripts from npm package - TypeError: require(...) is not a function
  at Robot.loadExternalScripts (/opt/hubot-rafiki/node_modules/hubot/src/robot.coffee:401:11, <js>:272:39)
  at /opt/hubot-rafiki/node_modules/hubot/bin/hubot:152:11, <js>:159:26
  at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:380:3)

This is because index.coffee is empty. I will propose a PR to fix this shortly.