Report missing https support for URL

[paul-matthews]

Instead of throwing an "Unhandled 'error' event", report the lack of https connection gracefully.

Example of error below:

events.js:154
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 35.202.93.55:443
    at Object.exports._errnoException (util.js:856:11)
    at exports._exceptionWithHostPort (util.js:879:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1062:14)