[TIMOB-8751] Android: Ti.Geolocation.getPreferredProvider() crashes the app when location services are disabled

Problem description

If you call Titanium.Geolocation.getPreferredProvider() and the Geo services are not enabled, the app will crash.

Actual results

The app crashes

Expected results

IF there is no geo services enabled, just warn the user.

Test Case.

1. Create a new mobile project. 2. Paste this code:

	Ti.API.info(Titanium.Geolocation.getPreferredProvider());

3. Disable Geolocation services in the device. 4. Build for device. 5. Run the app

HD Discussion

http://support-admin.appcelerator.com/display/APP-423883

Workaround

if(Titanium.Geolocation.getLocationServicesEnabled()){
	Ti.API.info(Titanium.Geolocation.getPreferredProvider());
} else {
	alert('Geo Services not enabled');
	Ti.API.info("Geo Services not enabled");
}