Dev fix: Destroy wasn't working when using deferred rendering

- The _pluck() function that was being used to get the tr elements
  didn't remove nulls, while jQuery doesn't like removing a class from!

- Thanks to `RagingTroll` in the forums for spotting this:
  http://datatables.net/forums/discussion/18651

.datatables-commit-sync

@@ -1 +1 @@
-118619e940c35fea478e5bfe6c3ebc66d8c83923
+a2dd5b40d76ce4522b126827c725fdf5fd3d608a

media/js/jquery.dataTables.js

@@ -8422,7 +8422,7 @@
 			var jqTable   = $(table);
 			var jqTbody   = $(tbody);
 			var jqWrapper = $(settings.nTableWrapper);
-			var rows      = _pluck( settings.aoData, 'nTr' );
+			var rows      = $.map( settings.aoData, function (r) { return r.nTr; } );
 			var i, ien;
 	
 			// Flag to note that the table is currently being destroyed - no action