diff -r 08cd160ec1c6 -r 3b4abb1ec5a3 java/sql-vyuka/src/java/cz/frantovo/sql/vyuka/dao/HistorieDAO.sql.xml
--- a/java/sql-vyuka/src/java/cz/frantovo/sql/vyuka/dao/HistorieDAO.sql.xml	Fri May 29 04:09:58 2009 +0200
+++ b/java/sql-vyuka/src/java/cz/frantovo/sql/vyuka/dao/HistorieDAO.sql.xml	Wed Feb 08 13:15:23 2012 +0100
@@ -5,7 +5,9 @@
         <![CDATA[
         SELECT *
         FROM historie
-        WHERE id_sezeni = ?
+        WHERE   id_sezeni = ?
+                AND sql IS NOT NULL
+                AND sql <> ''
         ORDER BY id DESC
         LIMIT 20
         ]]>