Index: branches/unlabeled/unlabeled-1.4.2/core/admin_templates/js/script.js
===================================================================
diff -u -r7796 -r7821
--- branches/unlabeled/unlabeled-1.4.2/core/admin_templates/js/script.js	(.../script.js)	(revision 7796)
+++ branches/unlabeled/unlabeled-1.4.2/core/admin_templates/js/script.js	(.../script.js)	(revision 7821)
@@ -1294,6 +1294,7 @@
 
 NumberFormatter.Parse = function(num)
 {
+	if (num == '') return 0;
 	return parseFloat( num.toString().replace(this.ThousandsSep, '').replace(this.DecimalSep, '.') );
 }