[TIMOB-13978] iOS: Geolocation - Error messages are displayed in alert instead of currentHeading and currentPosition

Error messages are displayed in alert instead of currentHeading and currentPosition. This is not regression since the issue occurs in 3.1.0 GA as well. Steps to reproduce: 1. Create an app using the code below. 2. launch the app. Actual: Two alerts are dispalyed stating: Error: Invalid type passed to the function. Expected: Should display current heading and current position null alerts.

Titanium.UI.setBackgroundColor('#000');

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});

function test(fn)
		{
			try { fn(); }
			catch(e) { alert(e.toString()); }
		}
		
		test(function(){
			Ti.Geolocation.getCurrentHeading();
		});
		
		test(function(){
			Ti.Geolocation.getCurrentPosition();
		});
		
		win1.open();