add: 진행 중인 티켓팅이 아닐 때, 대기열 조회 시 예외처리 추가

Author: kitaee

src/main/java/TiCatch/backend/domain/ticketing/service/TicketingService.java

@@ -147,6 +147,8 @@ public TicketingWaitingResponseDto addTicketingWaitingQueue(Long ticketingId, St
 
     public TicketingWaitingResponseDto getTicketingWaitingStatus(Long ticketingId, Long userId) {
         Long rank = redisService.getWaitingQueueRank(ticketingId, userId.toString());
+        Ticketing ticketing = ticketingRepository.findById(ticketingId).orElseThrow(NotExistTicketException::new);
+        validateTicketing(ticketing, userId);
         return TicketingWaitingResponseDto.of(ticketingId, userId, rank);
     }