jquery/jquery-ui — pull request #707 by i8ramin (2012-08-02 19:16:47+00:00)
Title: Check for ddmanager.dragStart and ddmanager.dragStop

Check for existence of ```$.ui.ddmanager.dragStart``` and ```$.ui.ddmanager.dragStop``` before using them. Throwing exceptions otherwise.

This happens when you include are using jquery.ui.draggable but not jquery.ui.droppable.