allow null callback in rollback:

--- persistence.store.mysql.js~
+++ persistence.store.mysql.js
@@ -84,7 +84,7 @@
     that.rollback = function(session, callback){
       that.executeSql("ROLLBACK", null, function() {
         session.clean();
-        callback();
+        callback && callback();
       });
     }
     return that;

Submitted by tg on 15 November 2010 at 02:42