MDL-59076 format_weeks: if 'enddate' does not exist in backup then use 0

course/format/weeks/backup/moodle2/restore_format_weeks_plugin.class.php

@@ -162,8 +162,11 @@ class restore_format_weeks_plugin extends restore_format_plugin {
 
         $data = $this->connectionpoint->get_data();
 
+        // Backup may not include the end date, so set it to 0.
+        $enddate = isset($data['tags']['enddate']) ? $data['tags']['enddate'] : 0;
+
         // Set the automatic end date setting and the course end date (if applicable).
-        $this->update_automatic_end_date($data['tags']['enddate']);
+        $this->update_automatic_end_date($enddate);
 
         if (isset($data['tags']['numsections'])) {
             // Update course sections visibility.