wip: additional services with constraints

src/Form/Service/Abstract/AbstractFieldStateProvider.php

@@ -141,4 +141,4 @@ abstract class AbstractFieldStateProvider implements FieldStateProviderInterface
      * specific field state conditions.
      */
     abstract protected function registerFieldStateConditions(): void;
-}
+}

src/Form/Service/Abstract/AbstractParticipantFieldHandler.php

@@ -63,6 +63,7 @@ abstract class AbstractParticipantFieldHandler implements ParticipantFieldHandle
     protected function getParticipant(BookingDtoInterface $bookingDto, int $participantIndex): ?object
     {
         $participants = $bookingDto->getParticipants();
+
         return $participants[$participantIndex] ?? null;
     }
 
@@ -151,4 +152,4 @@ abstract class AbstractParticipantFieldHandler implements ParticipantFieldHandle
     {
         return [];
     }
-}
+}