MDL-9040: Enabled disabling of any buttons that always lead to errors. Javascript dynamically displays/hides buttons depending on which groupings/groups are selected. This required a number of extensive modifications, but degrades nicely without JS.

group/lib/utillib.php

@@ -39,6 +39,11 @@ function groups_count_group_members($groupid) {
 function groups_count_groups_in_grouping($groupingid, $courseid) {
     if (GROUP_NOT_IN_GROUPING == $groupingid) {
         $groupids = groups_get_groups_not_in_any_grouping($courseid);
+        
+        if ($groupids === false) {
+            return false;
+        }
+        
         return count($groupids);
     } elseif (GROUP_ANY_GROUPING == $groupingid) {
         return count_records('groups_courses_groups', 'courseid', $courseid);
@@ -414,4 +419,4 @@ function groups_param_action($prefix = 'act_') {
     return $action;
 }
 
-?>
+?>