The way Listbox_getReportTreeStructure calls a function recursively on each line makes it often it the max recursion depth. It is also called unnecessarily when the tree is open but nothing is selected. For now don't make it recurse when it's open but not selected

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44336 20353a03-c40f-0410-a6d1-a30d3c3de9de