zkoss/zk — pull request #13 by zanyking (2012-06-28 07:07:09+00:00)
Title: Bug1185 Two collection on zul page returning null when both of them becomes empty

Dennis review
This is due to a TrackerImpl Logical issue, I provide a quick fix for this one first and opened a new Tracker
http://tracker.zkoss.org/browse/ZK-1225