Fix bad conditional in getInventoryAssetPrice that makes sometimes adding float and None

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5654 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Tool/SimulationTool.py

@@ -622,7 +622,7 @@ class SimulationTool (BaseTool):
       total_result = 0.0
       if len(result) > 0:
         for result_line in result:
-          if result_line.inventory is not None:
+          if result_line.total_price is not None:
             total_result += result_line.total_price
       
       return total_result