[TIMOB-10571] MobileWeb: animation - is throwing Cannot read property '_layout' of undefined

Animations are causing an error "Cannot read property '_layout' of undefined" when they are trying to run on an item that is not yet attached to a the window.

Steps to repro:

1. run the code below 2. click the window 3. notice the error "Cannot read property '_layout' of undefined"

var win  = Ti.UI.createWindow({
	backgroundColor: 'white'
});
win.open();

win.addEventListener('click', function(){
	var view = Ti.UI.createView({
		height: 50,
		width: 50,
		backgroundColor: 'blue'
	});

	view.animate({
		top: 0,
		duration: 300
	});
});