Agenda: Validate attachment to update in course event - refs BT#19392

main/calendar/agenda.php

@@ -272,7 +272,7 @@ if ($allowToEdit) {
                 $endDate = $values['date_range_end'];
 
                 $sendAttachment = isset($_FILES) && !empty($_FILES);
-                $attachmentList = $sendAttachment ? $_FILES : null;
+                $attachmentList = $sendAttachment ? $_FILES : [];
                 $attachmentCommentList = $values['legend'] ?? '';
                 $comment = $values['comment'] ?? '';
                 $notificationCount = $_REQUEST['notification_count'] ?? [];

main/inc/lib/agenda.lib.php

@@ -1137,6 +1137,10 @@ class Agenda
                     if (isset($attachmentArray) && !empty($attachmentArray)) {
                         $counter = 0;
                         foreach ($attachmentArray as $attachmentItem) {
+                            if (empty($attachmentItems['id'])) {
+                                continue;
+                            }
+
                             $this->updateAttachment(
                                 $attachmentItem['id'],
                                 $id,