Merge pull request #407 from Juinjang/fix/#406

[fix/#406] 조회수 NPE fix

Author: PicturePark1101

src/main/java/umc/th/juinjang/api/note/shared/service/ViewCountService.java

@@ -54,6 +54,12 @@ public Long getRedisViewCount(long sharedNoteId) {
 
 			if (value == null) {
 				Long viewCountFromDb = sharedNoteFinder.findViewCountById(sharedNoteId);
+
+				if (viewCountFromDb == null) {
+					log.warn("DB의 sharedNote 조회수가 null sharedNoteId={}", sharedNoteId);
+					viewCountFromDb = 0L;
+				}
+				
 				redisTemplate.opsForValue().set(key, viewCountFromDb.toString());
 				return viewCountFromDb;
 			}

src/main/java/umc/th/juinjang/domain/note/shared/model/SharedNote.java

@@ -83,12 +83,14 @@ public static SharedNote toSharedNote(Member member, Limjang limjang, SharedNote
 			.month(dto.month())
 			.period(dto.period())
 			.isImageShared(dto.isImageShared())
+			.viewCount(0L)
 			.build();
 	}
 
 	public void updatePrice(long price) {
 		this.price = price;
 	}
+
 	public void updateDeletedAt(Timestamp deletedAt) {
 		this.deletedAt = deletedAt;
 	}