Homebridge Issue
These are the current errors I am getting for this plugin! Any advice?


```
/homebridge/node_modules/homebridge-webos-tv/index.js:86
    this.inputNamesFile = this.prefsDir + 'inputs_' + this.mac.split(':').join('');
                                                               ^
TypeError: Cannot read property 'split' of undefined
    at new webosTvAccessory (/homebridge/node_modules/homebridge-webos-tv/index.js:86:64)
    at Server._loadAccessories (/usr/local/lib/node_modules/homebridge/lib/server.js:297:29)
    at Server.run (/usr/local/lib/node_modules/homebridge/lib/server.js:87:38)
    at module.exports (/usr/local/lib/node_modules/homebridge/lib/cli.js:45:10)
    at Object.<anonymous> (/usr/local/lib/node_modules/homebridge/bin/homebridge:17:22)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
```