modify not to raise KeyError if the specified key is missing.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34162 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_simulation/DocumentTemplateItem/InvoiceTransactionSimulationRule.py

@@ -207,7 +207,7 @@ class InvoiceTransactionRuleMovementGenerator(MovementGeneratorMixin):
     exchange_ratio = None
     precision = None
     try:
-      section = prevision_line[arrow][0]
+      section = prevision_line.get(arrow, [])[0]
     except IndexError:
       section = None
     if section is not None:

bt5/erp5_simulation/bt/revision

-79
\ No newline at end of file
+80
\ No newline at end of file