HTML5 drag event breaks Packery when using with jQuery UI Draggable handle option

[wmaca]

Packery's bindUIDraggableEvents expects a ui parameter. The problem is that when the event is not triggered by jQuery, no ui parameter is passed. This causes an attempt to access position of undefined.

Don't know if dragabilly handles it correctly.

To reproduce the error, access http://jsfiddle.net/4tee5qav/1/
There, you should select the "content" text, and drag it.

My temporary fix wast to add an if (!ui) return; on Packery's bindings.

[desandro]

Thanks so much for reporting this issue. It will be fixed in the next release.