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

Hi @marclundgren,

Attached is an update for https://issues.liferay.com/browse/AUI-1288.

I think the check (if target == boundingBox) is good enough to make sure the Enter key was pressed inside the datatable.  I couldn't reproduce a situation where it wasn't.  But I also considered adding another case where the target could be a child of the boundingBox, which would evaluate the condition to true.

Also, should there always be newline at the end of the file? My commit removed it because I think sublime trimmed it for me.

Please let me know your thoughts.

Thanks!