[AC-5143] Titanium.App.uncaughtException does not get fired even when forcing JS errors

   /**
    * This file is used to validate iOS test-cases. It is ran using the Xcode
    * project in titanium_mobile/iphone/iphone/Titanium.xcodeproj.
    *
    * Change the below code to fit your use-case. By default, it included a button
    * to trigger a log that is displayed in the Xcode console.
    */
   
   var win = Ti.UI.createWindow({
       backgroundColor: '#fff'
   });
   
   Ti.App.addEventListener("uncaughtException", function (e) {
     Ti.API.info("Uncaught JS exception captured");
   });
    
   var btn = Ti.UI.createButton({
       title: 'Trigger'
   });
   
   btn.addEventListener('click', function() {
     var b = 1/a;
     var c = a*b+c;
     throw new Error("Error Capture Test");
   });
   
   win.add(btn);
   win.open();