Bug:  This plugin generated a warning from the characteristic 'Current Relative Humidity': characteristic value expected valid finite number and received "undefined."
### Describe the Bug

I am receiving the following error in Homebridge logs:

`This plugin generated a warning from the characteristic 'Current Relative Humidity': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.`

I am using the SwitchBot Hub 2 and have configured that device as the ambient temperature for my DIY Air Conditioner device within your plugin's settings.

### To Reproduce

This error message appears right after this log message:

`[SwitchBot] update temperature and humidity for Hub 2`

### Expected Behavior

Expecting temperature and humidity readings to appear normally.

### Relevant Log Output

```shell
[SwitchBot] update temperature and humidity for Hub 2
[@switchbot/homebridge-switchbot] This plugin generated a warning from the characteristic 'Current Temperature': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.
[@switchbot/homebridge-switchbot] This plugin generated a warning from the characteristic 'Current Relative Humidity': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.
[SwitchBot] update temperature and humidity for Hub 2
```


### Config for homebridge-switchbot

```shell
{
                        "deviceId": "REDACTED",
                        "configDeviceName": "Hub 2",
                        "hide_device": false,
                        "configDeviceType": "Hub 2",
                        "hidHub": {
                            "hide_temperature": false,
                            "hide_humidity": false
                        }

"irdevices": [
                    {
                        "deviceId": "REDACTED",
                        "configDeviceName": "Air Conditioner",
                        "configRemoteType": "DIY Air Conditioner",
                        "connectionType": "OpenAPI",
                        "customize": false,
                        "irair": {
                            "hide_automode": true,
                            "meterType": "Hub 2",
                            "meterId": "REDACTED"
                        }
```


### Screenshots

_No response_

### Device and Model

SwitchBot Hub 2

### Node.js Version

v18.17.0 

### NPM Version

9.6.7

### Homebridge Version

1.6.1

### Homebridge Switchbot Plugin Version

2.7.0

### Homebridge Config UI X Plugin Version

_No response_

### Operating System

LePotato running Armbian