Use more zopish API

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@37014 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Tool/ContributionTool.py

@@ -362,7 +362,7 @@ class ContributionTool(BaseTool):
         new_id = module.generateNewId()
       else:
         new_id = id
-      existing_document = module.get(new_id, None)
+      existing_document = module._getOb(new_id, None)
       if existing_document is None:
         # There is no preexisting document - we can therefore
         # set the new object