Merge branch 'excess-participants-without-additional-participants'

[#78] Show validation warning instead of an error if `remote_registration_additional_participants_waitlist` is disabled, but request has no additional participants

Author: jensschuppe

CRM/Remoteevent/RegistrationProfile.php

@@ -204,8 +204,11 @@ function(int $carry, string $item) {
             && ($excessParticipants = CRM_Remoteevent_Registration::getRegistrationCount($event['id']) + 1 + $additionalParticipantsCount - $event['max_participants']) > 0
         ) {
             if (
-              !empty($event['has_waitlist'])
-              && !empty($event['event_remote_registration.remote_registration_additional_participants_waitlist'])
+                !empty($event['has_waitlist'])
+                    && (
+                        $additionalParticipantsCount === 0
+                        || !empty($event['event_remote_registration.remote_registration_additional_participants_waitlist'])
+                    )
             ) {
                 $validationEvent->addWarning(
                     $l10n->localise('Not enough vacancies for the number of requested participants.')