Draggable Grouping does not trigger onGroupChanged on the last group removed

[ghiscoding]

I am assuming @muthukumarse can help on this one. I started using this nice Draggable Grouping plugin and I noticed that when removing the last group, it doesn't trigger the onGroupChanged, the reason is because of this line

In my lib, I added another way to change the grouping by giving the user the possibly to use the dragging or by using select dropdown that I display over the grid. I use the onGroupChanged to know when to update the dropdowns, hovewer when I delete the last group from the drop area, it doesn't trigger the onGroupChanged and the problem is on this line

See a demo of what I mean

[ghiscoding]

closed by merge of #300

[muthukumarse]

Thanks @ghiscoding