Bug fixed ZK-2178: NullPointerException showed when biglistbox doesn't provide any MatrixModel
http://tracker.zkoss.org/browse/ZK-2178
Bug fixed ZK-2185: Setting listitems draggable&droppable makes inner listbox not showing correctly in mold=select
http://tracker.zkoss.org/browse/ZK-2185
Merge remote-tracking branch 'upstream/6.5'
Merge remote-tracking branch 'Noah/B65-ZK-2185' into 6.5
Merge remote-tracking branch 'upstream/6.5'