#48 Make required time check more robust

classes/task/email_certificate_task.php

@@ -117,10 +117,12 @@ class email_certificate_task extends \core\task\scheduled_task {
                     }
 
                     // Check that they have passed the required time.
+                    if (!empty($customcert->requiredtime)) {
                         if (\mod_customcert\certificate::get_course_time($customcert->courseid,
                                 $enroluser->id) < ($customcert->requiredtime * 60)) {
                             continue;
                         }
+                    }
 
                     // Ok, issue them the certificate.
                     $customcertissue = new \stdClass();