Undefined author object throws TypeError

[ferdinand]

If the author object is not defined in the media.json file a TypeError is thrown.

[
  {
    "name": "Ukulele Song",
    "url": "https://freepd.com/music/Ukulele%20Song.mp3"
  }
]

The above JSON leads to the following error message:

[8/3/2019, 12:23:10 AM] TypeError: Cannot read property 'name' of undefined
    at AutomationChromecastPlay.playRandomMedia (/homebridge/node_modules/homebridge-automation-chromecast-play/index.js:116:44)
    at AutomationChromecastPlay.setSwitch (/homebridge/node_modules/homebridge-automation-chromecast-play/index.js:85:12)
    at Characteristic.On.emit (events.js:198:13)
    at Characteristic.On.Characteristic.setValue (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Characteristic.js:321:10)
    at Bridge.<anonymous> (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:882:22)
    at Array.forEach (<anonymous>)
    at Bridge.Accessory._handleSetCharacteristics (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:822:8)
    at HAPServer.emit (events.js:198:13)
    at HAPServer._handleCharacteristics (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:974:10)
    at HAPServer.<anonymous> (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:209:39)

An empty author object works:

[
  {
    "name": "Ukulele Song",
    "url": "https://freepd.com/music/Ukulele%20Song.mp3",
    "author": {
    }
  }
]

As the author.name attribute is not required it shouldn't be required to define an (empty) author object.