[TIMOB-26751] Hyperloop Android: Cannot read property 'apiName' null upon calling callback

While using a third-party [Android Calendar](https://github.com/psinetron/slycalendarview) library with *Hyperloop* for date-range selection, we are getting a crash error as below. {noformat} [ERROR] : TiExceptionHandler: (main) [6808,6808] /hyperloop/ru.slybeaver.slycalendarview.SlyCalendarDialog$Callback.js:32 [ERROR] : TiExceptionHandler: if (arg.apiName && arg.isNativeProxy && arg.isInstanceProxy) { // Assume hyperloop proxy, wrap in JS wrapper [ERROR] : TiExceptionHandler: ^ [ERROR] : TiExceptionHandler: TypeError: Cannot read property 'apiName' of null [ERROR] : TiExceptionHandler: at _wrapArg (/hyperloop/ru.slybeaver.slycalendarview.SlyCalendarDialog$Callback.js:32:12) [ERROR] : TiExceptionHandler: at Instance._wrapArgs (/hyperloop/ru.slybeaver.slycalendarview.SlyCalendarDialog$Callback.js:42:18) [ERROR] : TiExceptionHandler: at Instance.modified.(anonymous function) (/hyperloop/ru.slybeaver.slycalendarview.SlyCalendarDialog$Callback.js:55:53) [ERROR] : TiExceptionHandler: [ERROR] : TiExceptionHandler: org.appcelerator.kroll.runtime.v8.V8Function.nativeInvoke(Native Method) [ERROR] : TiExceptionHandler: org.appcelerator.kroll.runtime.v8.V8Function.callSync(V8Function.java:55) [ERROR] : TiExceptionHandler: org.appcelerator.kroll.runtime.v8.V8Function.call(V8Function.java:41) [ERROR] : TiExceptionHandler: hyperloop.HyperloopInvocationHandler.invoke(HyperloopInvocationHandler.java:58) [ERROR] : TiExceptionHandler: java.lang.reflect.Proxy.invoke(Proxy.java:913) [ERROR] : TiExceptionHandler: $Proxy0.onDataSelected(Unknown Source) [ERROR] : TiExceptionHandler: ru.slybeaver.slycalendarview.SlyCalendarView$2.onClick(SlyCalendarView.java:133) [ERROR] : TiExceptionHandler: android.view.View.performClick(View.java:6294) [ERROR] : TiExceptionHandler: android.view.View$PerformClick.run(View.java:24770) [ERROR] : TiExceptionHandler: android.os.Handler.handleCallback(Handler.java:790) [ERROR] : V8Exception: Exception occurred at /hyperloop/ru.slybeaver.slycalendarview.SlyCalendarDialog$Callback.js:32: Uncaught TypeError: Cannot read property 'apiName' of null {noformat} This error is happening when we click *Save* button (see attached screenshots for Save button UI) either without selecting any date or after selecting only start or single date. Selecting start and end dates both is giving correct/expected results. Also note that I tried this in native Android sample app using Android Studio and it's not crashing there in any cases. Seems it's pretty related to *Hyperloop* if any argument in listener callback method is found as null. *_Sample code for reproducing this error:_*

var AppCompatActivity = require('android.support.v7.app.AppCompatActivity');
var SlyCalendarDialog = require('ru.slybeaver.slycalendarview.SlyCalendarDialog');


function showCalendar(e){
    // need to pass support-fragment manager to this library
    var compatActivity = new AppCompatActivity(Ti.Android.currentActivity);

    new SlyCalendarDialog()
        .setSingle(false)
        .setCallback(new SlyCalendarDialog.Callback({
            onCancelled : function () {
                alert('calendar dialog cancelled');
            },
    		onDataSelected: function(firstDate, secondDate, hours, minutes) {
    			try {
                                Ti.API.info('firstDate - ' + firstDate);
        			Ti.API.info('secondDate - ' + secondDate);
        			Ti.API.info('hours - ' + hours);
        			Ti.API.info('minutes - ' + minutes);
                } catch (exc) {
                    Ti.API.error('exc - ' + exc);
                }
    		}
    	}))
        .show(compatActivity.getSupportFragmentManager(), "TAG_SLYCALENDAR");
}

var win = Ti.UI.createWindow();

var btn = Ti.UI.createButton({ 'title' :'Show Calendar' });
btn.addEventListener('click', showCalendar);

win.add(btn);

win.open();

*_Steps to reproduce:_* 1- Run the sample code in a test app after properly adding the attached .aar file. 2- Tap on Show Calendar button, the calendar dialog should open now. 3- Without selecting any date, tap on Save button inside dialog. 4- This error should come up. Tap on Continue to run further tests. 5- Now open the calendar dialog again and select a single date and tap on Save, the error will come up again. 6- Open the dialog again and select start and end dates and tap on Save, this time it will print the result properly. I cannot find any work-around here as of now, so I am looking forward to get a quick fix for this bug as early as possible. _*Note:*_ I have attached the .aar file for this library and the required screenshots (UI theme may differ but that should not affect the code functionality at all). Also here's [My Own KitchenSink](https://drive.google.com/file/d/17U1IFY1rNSjy_o1X0En_qVFyQAPNJOHH/view?usp=sharing) test app I have been using for all sample stuffs. You can try this sample in this test app.