Added Ifnull to ZSQL method for correcting the FIFO value if there were no outgoing transactions.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Resource_zGetAssetPrice.xml

@@ -121,7 +121,7 @@ quantity at each step:\n
 */\n
 SET\n
  @unbalanced_output:=\n
-   (SELECT\n
+   IFNULL((SELECT\n
       SUM(-quantity)\n
     FROM\n
       stock, catalog\n
@@ -129,7 +129,7 @@ SET\n
       quantity < 0\n
     AND\n
       <dtml-var where_expression>\n
-    ),\n
+    ),0),\n
  @total_asset_price=0\n
 <dtml-var sql_delimiter>\n
 \n

product/ERP5/bootstrap/erp5_core/bt/revision

-40958
\ No newline at end of file
+40959
\ No newline at end of file