[Bug] Unable to create supported accessory (aqara temp)
**Describe the bug**
Seems to be unable to create valid accessories. Acessories pop up in homekit but are marked as *Not supported*

Homebridge output
```
[10/18/2020, 5:04:29 PM] [zigbee2mqtt] Connecting to MQTT server at mqtt://localhost:1883
[10/18/2020, 5:04:29 PM] [zigbee2mqtt] Restoring accessory: temp/storage
[10/18/2020, 5:04:29 PM] [zigbee2mqtt] Publish to 'zigbee2mqtt/0x00158d000540e656/get': ''
[10/18/2020, 5:04:29 PM] [zigbee2mqtt] Publish to 'zigbee2mqtt/bridge/config/devices/get': ''
```

This `[10/18/2020, 5:04:29 PM] [zigbee2mqtt] Publish to 'zigbee2mqtt/0x00158d000540e656/get': ''` seems invalid do not now if thats related. But sending empty string to `device/get` generates error in Zigbee2Mqtt

From zigbee2mqtt output
```
Zigbee2MQTT:error 2020-10-18 16:04:29: Invalid JSON '', skipping...
````

**Expected behavior**

Expecting it to create a valid accessory (in this case a aqara temp sensor)

**MQTT messages**

* The device identification from `zigbee2mqtt/bridge/config/devices`

```javascript
{"dateCode":"20191205","description":"Aqara temperature, humidity and pressure sensor","friendly_name":"temp/storage","hardwareVersion":30,"ieeeAddr":"0x00158d000540e656","lastSeen":1603036668625,"manufacturerID":4151,"manufacturerName":"LUMI","model":"WSDCGQ11LM","modelID":"lumi.weather","networkAddress":11072,"powerSource":"Battery","softwareBuildID":"3000-0001","type":"EndDevice","vendor":"Xiaomi"}
```

**Versions used**
Please provide the version of the following pieces of software:
 - This plugin 0.0.7
 - Homebridge 1.2.3
 - Zigbee2mqtt 1.15.0
 - Homebridge Config UI X 4.29.0
