Simulation movement has not always the price attribute.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3172 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/MovementGroup.py

@@ -477,7 +477,10 @@ class FakeMovement:
     """
       Return calculated price
     """
-    return getattr(self, self.__price_method)()
+    if self.__price_method is not None:
+      return getattr(self, self.__price_method)()
+    else:
+      return None
   
   def setPriceMethod(self, method):
     """