gettatr must raise on method name if _tree is None

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17629 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Core/Folder.py

@@ -839,6 +839,8 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder, Base, FolderMixIn,
     if self._folder_handler == HBTREE_HANDLER:
       return CMFHBTreeFolder.__getattr__(self, name)
     else:
+      if self._tree is None:
+        raise AttributeError, name
       return CMFBTreeFolder.__getattr__(self, name)
     
   def __len__(self):