[TIMOB-16379] Android: getLoading method does not exist on Android and causes a crash

var window = Titanium.UI.createWindow({
    title: 'Test',
    fullscreen: true,
    exitOnClose: true,
    backgroundColor: 'white'
});
 
var view = Ti.UI.createView();
 
var webview = Titanium.UI.createWebView({
    backgroundColor: 'transparent',
    url: '/test.html'
});
 
view.add(webview);
window.add(view);
 
window.open();

alert ("getLoading: " + webview.getLoading());