Taglib prints the TAH constructor with revision number parameter only if updateUrl is provided.
But the revision number is also used with http request to the targetUrl.
So when i open a node i see a get with revisionNumber=undefined but the taglib entry in the jsp page looks like
<sz:treeAjaxHandler jsName="tah" targetUrl="SubtreeAction.action"
revisionNumber="0" cache="true" />