add missing variable initialisation

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31212 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/TradeCondition.py

@@ -202,7 +202,7 @@ class TradeCondition(Path, Transformation, XMLMatrix):
             if base_application in other_line.getBaseContributionList():
               father_dict[line].append(other_line)
               child_dict[other_line].append(line)
-
+      final_list = []
       if len(father_dict):
         # find roots elements
         # XXX maybe this can be done while building the graph