Fixed "method id not defined".

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5858 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Resource.py

@@ -585,6 +585,7 @@ class Resource(XMLMatrix, CoreResource, Variated):
       Return the value of the property used to calculate variable pricing
       This basically calls a script like Product_getPricingVariable
       """
+      method = None
       if context is not None:
         method = context._getTypeBasedMethod('getPricingVariable')
       if method is None or context is None: