Error handling accessories
I'm seeing an error in log when setting up my Sony Android TV from 2015. Anything I'am doing wrong?

```
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [INFO] Adding new accessory: Sony Wohnzimmer
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [INFO] Sony Wohnzimmer: Initalizing Bravia API with PSK
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [INFO] Sony Wohnzimmer: Cheking authentication...
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [Config] Console is listening on port 8080.
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] Homebridge is running on port 51826.
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [INFO] Sony Wohnzimmer: Authenticated!
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [ERROR] Sony Wohnzimmer: An error occured while handling accessories!
May 01 13:52:59 raspberrypi homebridge[22568]: [5/1/2019, 13:52:59] [BraviaOSPlatform] [ERROR] {
May 01 13:52:59 raspberrypi homebridge[22568]:     "status": 500,
May 01 13:52:59 raspberrypi homebridge[22568]:     "message": "Internal Server Error",
May 01 13:52:59 raspberrypi homebridge[22568]:     "config": {
May 01 13:52:59 raspberrypi homebridge[22568]:         "transformRequest": {},
May 01 13:52:59 raspberrypi homebridge[22568]:         "transformResponse": {},
May 01 13:52:59 raspberrypi homebridge[22568]:         "timeout": 0,
May 01 13:52:59 raspberrypi homebridge[22568]:         "xsrfCookieName": "XSRF-TOKEN",
May 01 13:52:59 raspberrypi homebridge[22568]:         "xsrfHeaderName": "X-XSRF-TOKEN",
May 01 13:52:59 raspberrypi homebridge[22568]:         "maxContentLength": -1,
May 01 13:52:59 raspberrypi homebridge[22568]:         "headers": {
May 01 13:52:59 raspberrypi homebridge[22568]:             "Accept": "application/json, text/plain, */*",
May 01 13:52:59 raspberrypi homebridge[22568]:             "Content-Type": "application/json",
May 01 13:52:59 raspberrypi homebridge[22568]:             "X-Auth-PSK": "tv12345",
May 01 13:52:59 raspberrypi homebridge[22568]:             "User-Agent": "axios/0.18.0",
May 01 13:52:59 raspberrypi homebridge[22568]:             "Content-Length": 78
May 01 13:52:59 raspberrypi homebridge[22568]:         },
May 01 13:52:59 raspberrypi homebridge[22568]:         "method": "post",
May 01 13:52:59 raspberrypi homebridge[22568]:         "url": "http://192.168.2.148:80/sony/avContent",
May 01 13:52:59 raspberrypi homebridge[22568]:         "data": "{\"id\":1,\"method\":\"getCurrentExternalInputsStatus\",\"version\":\"1.0\",\"params\":[]}"
May 01 13:52:59 raspberrypi homebridge[22568]:     },
May 01 13:52:59 raspberrypi homebridge[22568]:     "data": {
May 01 13:52:59 raspberrypi homebridge[22568]:         "error": [
May 01 13:52:59 raspberrypi homebridge[22568]:             500,
May 01 13:52:59 raspberrypi homebridge[22568]:             "Internal Server Error"
May 01 13:52:59 raspberrypi homebridge[22568]:         ],
May 01 13:52:59 raspberrypi homebridge[22568]:         "id": 1
May 01 13:52:59 raspberrypi homebridge[22568]:     }
May 01 13:52:59 raspberrypi homebridge[22568]: }

```