[TIMOB-10949] iOS: Picker: getValue method for date picker, created without value property, return null till change event occurs

The date picker created without a value property returns null for getValue method till date is changed in the picker. This works fine in Android. This is not a regression. The issue occurs atleast as far as 2.0.1 Steps to Reproduce: 1. Create a test application with code below 2. Launch the application and click on the Get Value button and check console 3. Change the date 4. Again click on the Get Value button and check console Actual Result: After step 2: The getValue returns null After step 4: The getValue returns the selected value in the picker Expected Result: After step 2: The getValue should return the selected value (as the current date is shown selected in the picker by default)

var win = Ti.UI.createWindow({
    backgroundColor: '#000',
    layout: 'vertical',
    navBarHidden: true
});
  
var datePicker = Ti.UI.createPicker({
    type: Ti.UI.PICKER_TYPE_DATE,
    useSpinner: false
});
  
datePicker.addEventListener('change', function(e) {
  Ti.API.info('change event: value = ' + e.value);
});
  
var button = Ti.UI.createButton({
    title: 'Get value'
});
  
button.addEventListener('click', function(){
    Ti.API.info(datePicker.value);
    Ti.API.info(datePicker.getValue());
});
   
win.add(datePicker);
win.add(button);
  
win.open();