plugin crashes if HTTP response is not a JSON as expected

[cbrandlehner]

Describe the bug In case you connect to a not supported device, eg by mistaking the IP address, the plugin crashes.

To Reproduce Information on your wifi gateway from the daikin app:

1. Firmware version: 1.2.51
2. If known: Model information of the wifi gateway: 0AB9

Information on your configuration:

1. Homebridge config

   "accessories": [
       {
           "accessory": "Daikin-Local",
           "name": "Living room",
           "apiroute": "http://192.168.1.50"
       },
       {
           "accessory": "Daikin-Local",
           "name": "Master bedroom",
           "apiroute": "http://192.168.1.51"
       }
   ],

Information from the log:

1. Homebridge log file showing relevant information.

   
   6/20/2019, 6:30:53 AM] [Master bedroom] Successfully established connection.
   [6/20/2019, 6:30:53 AM] SyntaxError: Unexpected token 
   in JSON at position 8
   at JSON.parse (<anonymous>)
   at Daikin.<anonymous> (/root/.nvm/versions/node/v11.10.0/lib/node_modules/homebridge-daikin-local/index.js:437:21)
   at Request.self.callback (/root/.nvm/versions/node/v11.10.0/lib/node_modules/homebridge-daikin-local/node_modules/request/request.js:185:22)
   at Request.emit (events.js:197:13)
   at Request.<anonymous> (/root/.nvm/versions/node/v11.10.0/lib/node_modules/homebridge-daikin-local/node_modules/request/request.js:1161:10)
   at Request.emit (events.js:197:13)
   at IncomingMessage.<anonymous> (/root/.nvm/versions/node/v11.10.0/lib/node_modules/homebridge-daikin-local/node_modules/request/request.js:1083:12)
   at Object.onceWrapper (events.js:285:13)
   at IncomingMessage.emit (events.js:202:15)
   at endReadableNT (_stream_readable.js:1129:12)
   [6/20/2019, 6:30:53 AM] Got SIGTERM, shutting down Homebridge...

**Expected behavior**
Expecting no crash.

**Screenshots**
n/a

**Additional context**
nothing to add.

[cbrandlehner]

fixed in 2019.25.1