do not call the method if wa take the default value

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@8437 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Tool/IdTool.py

@@ -85,8 +85,17 @@ class IdTool(UniqueObject, Folder):
       l = threading.Lock()
       l.acquire()
       try:
-        last_id = self.dict_ids.get(id_group, default or 0)
+        class Dummy:
+          pass
+        dummy = Dummy()
+        last_id = self.dict_ids.get(id_group, dummy)
+        if last_id is dummy:
+          if default is None:
+            new_id=0
+          else:
+            new_id=default
 
+        else:
           # Now generate a new id
           if method is not None:
             new_id = method(last_id)