파일이 없을 경우 에러 수정

pav-server/src/main/java/com/palnet/biz/api/cns/qna/service/CnsQnaService.java

@@ -21,6 +21,7 @@ import org.springframework.web.multipart.MultipartFile;
 
 import javax.transaction.Transactional;
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -73,11 +74,20 @@ public class CnsQnaService {
         if (entity == null) throw new CustomException(ErrorCode.DATA_NOTFIND);
 
         // 파일 삭제(논리적 삭제)
-        List<ComnFileModel> prevFileInfos = comnFileService.getNormalFileListByGroupNo(entity.getFileGroupNo());
-        List<Integer> prevFileSnoList = prevFileInfos.stream().map(ComnFileModel::getFileSno).collect(Collectors.toList());
-        List<Integer> currentFileSnoList = rq.getFileInfos().stream().map(ComnFileModel::getFileSno).collect(Collectors.toList());
+        List<Integer> prevFileSnoList = new ArrayList<>();
+        List<Integer> currentFileSnoList = new ArrayList<>();
+        if (entity.getFileGroupNo() != null) {
+            List<ComnFileModel> prevFileInfos = comnFileService.getNormalFileListByGroupNo(entity.getFileGroupNo());
+            prevFileSnoList = prevFileInfos.stream().map(ComnFileModel::getFileSno).collect(Collectors.toList());
+        }
+        if (rq.getFileInfos() != null) {
+            currentFileSnoList = rq.getFileInfos().stream().map(ComnFileModel::getFileSno).collect(Collectors.toList());
+        }
+
         boolean isChange = prevFileSnoList.removeAll(currentFileSnoList);
-        if (isChange) comnFileService.deleteFilesByFileGroupNo(entity.getFileGroupNo()); // File 삭제
+        if (isChange) {
+            comnFileService.deleteFiles(prevFileSnoList); // File 삭제
+        }
 
         List<MultipartFile> files = rq.getFiles();
         if (files != null && !files.isEmpty()) comnFileService.fileUpload(files, entity.getFileGroupNo()); // File 업로드