handle Alexa PlaybackFailed Request

[hyzhak]

log failed track and play next one.

Examples of response:

{
  "version": "1.0",
  "context": {
    "AudioPlayer": {
      "offsetInMilliseconds": 238426,
      "token": "https://archive.org/download/nms2014-09-06.mtx.flac16/Nms2014-09-06D1t02.mp3",
      "playerActivity": "PLAYING"
    },
    "Display": {
      "token": ""
    },
    "System": {
      "application": {
        "applicationId": "amzn1.ask.skill.da879190-edd7-48b5-8b24-eca5254f58cf"
      },
      "user": {
        "userId": "amzn1.ask.account....."
      },
      "device": {
        "deviceId": "amzn1.ask.device.....",
        "supportedInterfaces": {
          "AudioPlayer": {},
          "Display": {
            "templateVersion": "1.0",
            "markupVersion": "1.0"
          },
          "VideoApp": {}
        }
      },
      "apiEndpoint": "https://api.amazonalexa.com",
      "apiAccessToken": "...."
    }
  },
  "request": {
    "type": "AudioPlayer.PlaybackFailed",
    "requestId": "amzn1.echo-api.request.24680567-6e1c-4dc1-ac9f-89a936ed02cd",
    "timestamp": "2018-04-27T13:00:05Z",
    "locale": "en-US",
    "currentPlaybackState": {
      "offsetInMilliseconds": 238426,
      "token": "https://archive.org/download/nms2014-09-06.mtx.flac16/Nms2014-09-06D1t02.mp3",
      "playerActivity": "PLAYING"
    },
    "error": {
      "message": "Player error occurred: java.lang.IllegalStateException",
      "type": "MEDIA_ERROR_UNKNOWN"
    },
    "token": "https://archive.org/download/nms2014-09-06.mtx.flac16/Nms2014-09-06D1t02.mp3"
  }
}