Index: category_form.php
===================================================================
RCS file: /cvsroot/moodle/moodle/grade/edit/tree/category_form.php,v
retrieving revision 1.9.2.2
diff -u -r1.9.2.2 category_form.php
--- category_form.php	20 Oct 2007 15:11:48 -0000	1.9.2.2
+++ category_form.php	12 Nov 2007 23:57:16 -0000
@@ -42,7 +42,8 @@
         // visible elements
         $mform->addElement('header', 'gradecat', get_string('gradecategory', 'grades'));
         $mform->addElement('text', 'fullname', get_string('categoryname', 'grades'));
-
+        $mform->addRule('fullname', null, 'required', null, 'client');
+        
         $mform->addElement('select', 'aggregation', get_string('aggregation', 'grades'), $options);
         $mform->setHelpButton('aggregation', array('aggregation', get_string('aggregation', 'grades'), 'grade'));