[Bug]: Exception java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.getcapacitor.PluginCall.getCallbackId()' on a null object reference

### Current Behavior

I've noticed the following crash happening in production:

```
Exception java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.getcapacitor.PluginCall.getCallbackId()' on a null object reference
at com.capacitorjs.plugins.geolocation.GeolocationPlugin$startWatch$1.invokeSuspend (GeolocationPlugin.kt)
```

### Expected Behavior

Not crashing on null object reference

### Reproduction

Hard to say as it's a bug reported by crashlytics. However it's pretty obvious from the code that it can happen: https://github.com/ionic-team/capacitor-geolocation/blob/1a2504a2b50f1793089bdbf029b010980d6dbcfa/android/src/main/kotlin/com/capacitorjs/plugins/geolocation/GeolocationPlugin.kt#L223

### Screenshots / Media

_No response_

### Environment Details

```Shell
Crashlytics
```

### Versions Affected

v7.1.6, v8.2.0

### Platforms Affected

- [ ] iOS
- [x] Android
- [ ] Web

### Notes / Comments

It would probably be sufficient to add a check similar to `if (call == null) { return }`