AUI-1288 - Datatable Property List errors when 'enter' key is pressed when no active cell

Hi Jon,

Attached is an update for https://issues.liferay.com/browse/AUI-1288.

I fixed the unit test that was failing.  It was caused by a new datatable being added to the test page in the time since I wrote the test.

Please let me know if there are any issues.

Thanks!