[TIMOB-1913] Setting url of Sound object outside create method causes crash

On the iphone, when creating a sound object, if the url is set outside the create method, the app crashes and does not log anything to the console window.

Sample Code:
var win = Ti.UI.currentWindow;

var newSound = Titanium.Media.createSound();
newSound.url = 'cricket.wav';
newSound.play();