fix a mistake in r31217. in OrderRuleMovementGenerator, if order is missing...

fix a mistake in r31217. in OrderRuleMovementGenerator, if order is missing getAggregatedMovementList returns an empty list not None.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31219 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/NewOrderRule.py

@@ -108,7 +108,7 @@ class OrderRuleMovementGenerator(object):
     """Input movement list comes from order"""
     order = context.getDefaultCausalityValue()
     if order is None:
-      return None
+      return []
     ret = []
     for movement in order.getMovementList(
       portal_type=order.getPortalOrderMovementTypeList()):