Fix empty user group select when editing an announcement see BT#14824

main/announcements/announcements.php

@@ -450,7 +450,7 @@ switch ($action) {
                 );
                 // when we want to remind the users who have never been active
                 // then we have a different subject and content for the announcement
-                if ($_GET['since'] == 'never') {
+                if ($_GET['since'] === 'never') {
                     $title_to_modify = sprintf(
                         get_lang('RemindInactiveLearnersMailSubject'),
                         api_get_setting('siteName')
@@ -475,6 +475,7 @@ switch ($action) {
         $announcementInfo = AnnouncementManager::get_by_id($courseId, $id);
         if (isset($announcementInfo) && !empty($announcementInfo)) {
             $to = AnnouncementManager::load_edit_users('announcement', $id);
+
             $defaults = [
                 'title' => $announcementInfo['title'],
                 'content' => $announcementInfo['content'],

main/inc/lib/course.lib.php

@@ -6051,7 +6051,7 @@ class CourseManager
     public static function addGroupMultiSelect($form, $groupInfo, $to = [])
     {
         $group_users = GroupManager::get_subscribed_users($groupInfo);
-        $array = self::buildSelectOptions(null, $group_users, $to);
+        $array = self::buildSelectOptions([$groupInfo], $group_users, $to);
 
         $result = [];
         foreach ($array as $content) {
@@ -6089,14 +6089,19 @@ class CourseManager
                         "GROUP:".$groupId,
                         $alreadySelected
                     )
-                    ) { // $alreadySelected is the array containing the groups (and users) that are already selected
-                        $user_label = ($thisGroup['userNb'] > 0) ? get_lang('Users') : get_lang('LowerCaseUser');
-                        $user_disabled = ($thisGroup['userNb'] > 0) ? "" : "disabled=disabled";
+                    ) {
+                        $userCount = isset($thisGroup['userNb']) ? $thisGroup['userNb'] : 0;
+                        if (empty($userCount)) {
+                            $userCount = isset($thisGroup['count_users']) ? $thisGroup['count_users'] : 0;
+                        }
+                        // $alreadySelected is the array containing the groups (and users) that are already selected
+                        $user_label = ($userCount > 0) ? get_lang('Users') : get_lang('LowerCaseUser');
+                        $user_disabled = ($userCount > 0) ? "" : "disabled=disabled";
                         $result[] = [
                             'disabled' => $user_disabled,
                             'value' => "GROUP:".$groupId,
                             // The space before "G" is needed in order to advmultiselect.php js puts groups first
-                            'content' => " G: ".$thisGroup['name']." - ".$thisGroup['userNb']." ".$user_label,
+                            'content' => " G: ".$thisGroup['name']." - ".$userCount." ".$user_label,
                         ];
                     }
                 }