check if the cpsdocument has the attribute .cps_layout

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@477 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5CPS/CPSDocumentPatch.py

@@ -97,13 +97,16 @@ class PatchedCPSDocument(CPSDocument):
 
   security.declarePrivate('getLayoutAndSchema' )
   def getLayoutAndSchema(self):
+    if hasattr(self,'.cps_layouts') and hasattr(self,'.cps_schemas'):
       return (aq_base(self._getOb(".cps_layouts")),aq_base(self._getOb(".cps_schemas")))
+    return None
 
   security.declarePrivate('setLayoutAndSchema' )
   def setLayoutAndSchema(self, data):
     """
     data must be : (layout,schema)
     """
+    if data is not None:
       self._setOb(".cps_layouts",data[0])
       self._setOb(".cps_schemas",data[1])