Verify that getDataModel is callable

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@503 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5CPS/CPSDocumentPatch.py

@@ -45,6 +45,7 @@ class PatchedCPSDocument(CPSDocument):
     type_info = self.getTypeInfo()
     field_list = []
     if type_info is not None:
+      if hasattr(type_info,'getDataModel'):
         data_model = type_info.getDataModel(self)
         if data_model is not None:
             field_list = data_model._fields.items()