fails to run if no ssl keys and certificates

[gb96]

The proxy should still run without https (ssl) support if no ssl.key is available.

node proxy.js

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: ENOENT, no such file or directory 'D:\path\to\ssl.key'
    at Object.openSync (fs.js:230:18)
    at Object.readFileSync (fs.js:120:15)
    at Object.<anonymous> (D:\pkrumins-nodejs-proxy\config.js:21:22)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Module.require (module.js:354:17)
    at require (module.js:370:17)
    at Object.<anonymous> (D:\pkrumins-nodejs-proxy\proxy.js:13:14)