Index: /branches/bills_081204/ippTools/share/difftool_definebyquery_part2.sql
===================================================================
--- /branches/bills_081204/ippTools/share/difftool_definebyquery_part2.sql	(revision 20957)
+++ /branches/bills_081204/ippTools/share/difftool_definebyquery_part2.sql	(revision 20958)
@@ -27,5 +27,5 @@
             warp_id = %lld
             AND ignored = 0
-            AND filter IS NOT NULL
+            AND filter = '%s'
             AND warpSkyfile.tess_id = bestStacks.tess_id
         -- (good fraction test goes here for example also above)