fix : oldImageUrl이 빈 문자열("")일 때에도 정상적으로 예외 처리하도록 수정

Author: NCookies

src/main/java/org/ezcode/codetest/application/usermanagement/user/service/UserService.java

@@ -35,6 +35,7 @@
 import org.springframework.stereotype.Service;
 
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
 
 import lombok.RequiredArgsConstructor;
@@ -107,7 +108,7 @@ public UserInfoResponse modifyUserInfo(AuthUser authUser, ModifyUserInfoRequest
 
 			user.modifyProfileImage(profileImageUrl);
 
-			if (oldImageUrl != null) {
+			if (StringUtils.hasText(oldImageUrl)) {
 				s3Uploader.delete(oldImageUrl, "profile");
 			}
 		}