### Eclipse Workspace Patch 1.0
#P moodle20
Index: mod/quiz/tabs.php
===================================================================
RCS file: /cvsroot/moodle/moodle/mod/quiz/tabs.php,v
retrieving revision 1.41
diff -u -r1.41 tabs.php
--- mod/quiz/tabs.php	8 Mar 2010 16:01:39 -0000	1.41
+++ mod/quiz/tabs.php	7 May 2010 03:21:26 -0000
@@ -100,12 +100,18 @@
     $row  = array();
     $currenttab = $mode;
 
-    $strgroup = get_string('groupoverrides', 'quiz');
+    if (!empty($groups)) {
+        $strgroup = get_string('groupoverrides', 'quiz');
+    } else {
+        $strgroup = get_string('groupoverridesnogroups', 'quiz');
+        $inactive[] = 'group';
+    }
     $struser = get_string('useroverrides', 'quiz');
 
-    $row[] = new tabobject('group', "$CFG->wwwroot/mod/quiz/overrides.php?cmid=$cm->id", $strgroup);
+    $row[] = new tabobject('group', "$CFG->wwwroot/mod/quiz/overrides.php?cmid=$cm->id&mode=group", $strgroup);
     $row[] = new tabobject('user', "$CFG->wwwroot/mod/quiz/overrides.php?cmid=$cm->id&mode=user", $struser);
     $tabs[] = $row;
+
 }
 
 if (!$quiz->questions) {
Index: mod/quiz/overrides.php
===================================================================
RCS file: /cvsroot/moodle/moodle/mod/quiz/overrides.php,v
retrieving revision 1.2
diff -u -r1.2 overrides.php
--- mod/quiz/overrides.php	20 Mar 2010 22:15:59 -0000	1.2
+++ mod/quiz/overrides.php	7 May 2010 03:21:26 -0000
@@ -31,9 +31,7 @@
 
 
 $cmid = required_param('cmid', PARAM_INT);  // course module ID, or
-$mode = optional_param('mode', 'group', PARAM_ALPHA); // one of 'user' or 'group'
-
-$groupmode = ($mode == "group");
+$mode = optional_param('mode', '', PARAM_ALPHA); // one of 'user' or 'group', default is 'group'
 
 if (! $cm = get_coursemodule_from_id('quiz', $cmid)) {
     print_error('invalidcoursemodule');
@@ -42,6 +40,23 @@
     print_error('invalidcoursemodule');
 }
 
+// Get the course groups
+$groups = groups_get_all_groups($cm->course, null, $cm->groupingid);
+if (empty($groups) && $mode == "group") {
+    // generate an error
+    $link = new moodle_url('/mod/quiz/overrides.php', array('cmid'=>$cm->id));
+    print_error('groupsnone', 'quiz', $link);
+}
+// Default mode is "group", unless there are no groups
+if ($mode != "user" and $mode != "group") {
+    if (!empty($groups)) {
+        $mode = "group";
+    } else {
+        $mode = "user";
+    }
+}
+$groupmode = ($mode == "group");
+
 $url = new moodle_url('/mod/quiz/overrides.php', array('cmid'=>$cm->id, 'mode'=>$mode));
 
 $PAGE->set_url($url);
Index: mod/quiz/lang/en/quiz.php
===================================================================
RCS file: /cvsroot/moodle/moodle/mod/quiz/lang/en/quiz.php,v
retrieving revision 1.22
diff -u -r1.22 quiz.php
--- mod/quiz/lang/en/quiz.php	3 May 2010 16:49:07 -0000	1.22
+++ mod/quiz/lang/en/quiz.php	7 May 2010 03:21:27 -0000
@@ -390,6 +390,8 @@
 $string['gradingdetailszeropenalty'] = 'You were not penalized for this submission.';
 $string['gradingmethod'] = 'Grading method: {$a}';
 $string['groupoverrides'] = 'Group overrides';
+$string['groupoverridesnogroups'] = 'Group overrides (no groups)';
+$string['groupsnone'] = 'There are no groups associated with this quiz';
 $string['guestsno'] = 'Sorry, guests cannot see or attempt quizzes';
 $string['hidebreaks'] = 'Hide page breaks';
 $string['hidereordertool'] = 'Hide the reordering tool';