PhoneAccount.isEnabled called on null object

Bug report

• [x ] I've checked the example to reproduce the issue.

• Reproduced on:

• [x ] Android

• iOS

Description

https://github.com/react-native-webrtc/react-native-callkeep/commit/6c18fdf5c7f183d8befb960bf6e1f79a86c9e2e8

I think this still has an issue. getPhoneAccount(handle) can return null, even when telecomManager is not null, causing isEnabled to be called on a null object.

Should be:

return isConnectionServiceAvailable() && telecomManager != null && telecomManager.getPhoneAccount(handle) != null && telecomManager.getPhoneAccount(handle).isEnabled();

Steps to Reproduce

Try to call setup on a device that has ConnectionService, but not PhoneAccount (any tablet with SDK > 23)

hasPhoneAccount cannot be used gracefully to detect this configuration as it crashes itself. supportConnectionService returns true on these devices.

Versions

- Callkeep: 3.0.12
- React Native: 0.61.5
- iOS: N/A
- Android: Any with SDK > 23

• Phone model: Various tablets

Logs

Locate the Android implementation of hasPhoneAccount and start from getPhoneAccount(handle), along with supportConnectionService and setup. Reproduce on an Android SDK greater than 23 tablet without a PhoneAccount; done means hasPhoneAccount handles the missing account without crashing and reports the unavailable state.