Android: Modules built before 9.3.0 will return empty string instead of null

Noticed during the SDK 9.3.0 migration: If you call a module getter and the value is null, thee app now crashes, because a Symbol type is returned instead of a bare null value. This works fine on iOS and used to work fine on Android as well (comparing to 9.2.2.GA).

It's easy to replicate:
1. Create a native module and add the following code:

@Kroll.getProperty

public String fcmToken()

{

	return null;

}

2. Add the module to your tiapp.xml with an 9.3.0 SDK included and call the getter:

console.warn(require('ti.test').fcmToken));

3. Notice the error
4. Change the SDK version back to 9.2.2.GA and run the same app again
5. Notice that it's behaving correctly and returning null.

I guess it's a regression from some kind of V8 change (see the full 9.2.2 <-- master diff here). Also see the ti.test module for quick reproduction attached to this ticket.

EDIT: Found a possible regression candidate this commit (as part of TIMOB-27787).