Bug: API Request: TypeError
### Describe The Bug

error shows up in log

### To Reproduce

just updated to V2.0. It might be because the Curtains are not grouped?

### Expected behavior

no error

### Relevant log output

```shell
[12/10/2022, 10:39:36] [SwitchBot] API Request: TypeError: Cannot read properties of undefined (reading 'toUpperCase')
[12/10/2022, 10:39:36] [SwitchBot] deviceName: Rote Gardine [Curtain Config] disable_group: undefined, UnGrouping true
[12/10/2022, 10:39:36] [SwitchBot] deviceName: Vorhang [Curtain Config] disable_group: undefined, UnGrouping true
```


### Config for homebridge-switchbot

```json
{
  "name": "SwitchBot",
  "credentials": {
    "token": "xxx",
    "secret": "xxx",
    "notice": "Keep your token a secret!"
  },
  "options": {
    "irdevices": [
      {
        "deviceId": "xxx",
        "configRemoteType": "TV"
      }
    ],
    "refreshRate": 30,
    "pushRate": 1,
    "logging": "standard"
  },
  "platform": "SwitchBot"
}
```


### Screenshots

_No response_

### Device & Model

na

### Node.js Version

v16.17.1 

### NPM Version

8.15.0

### Homebridge Version

v1.5.0

### Homebridge Switchbot Plugin Version

v2.0.0 

### Homebridge Config UI X Plugin Version

v4.50.1 

### Operating System

Raspian Buster