fix: 분석완료 상품 조회 불가 오류 수정

src/main/java/com/DecodEat/domain/products/controller/ProductController.java

@@ -47,7 +47,7 @@ public ApiResponse<ProductRegisterResponseDto> registerProduct(
             @CurrentUser User user,
             @RequestParam("name") String name,
             @RequestParam("manufacturer") String manufacturer,
-            @RequestPart("productImage") MultipartFile productImage,
+            @RequestPart(value = "productImage", required = false) MultipartFile productImage,
             @RequestPart("productInfoImages") List<MultipartFile> productInfoImages
     ) {
         ProductRegisterRequestDto requestDto = ProductRegisterRequestDto.builder()

src/main/java/com/DecodEat/domain/products/repository/ProductNutritionRepository.java

@@ -1,7 +1,12 @@
 package com.DecodEat.domain.products.repository;
 
+import com.DecodEat.domain.products.entity.Product;
 import com.DecodEat.domain.products.entity.ProductNutrition;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import javax.swing.text.html.Option;
+import java.util.Optional;
+
 public interface ProductNutritionRepository extends JpaRepository<ProductNutrition, Long> {
+    Optional<ProductNutrition> findByProduct(Product product);
 }

src/main/java/com/DecodEat/domain/products/service/ProductService.java

@@ -62,7 +62,7 @@ public ProductDetailDto getDetail(Long id) {
         List<ProductInfoImage> images = productImageRepository.findByProduct(product);
         List<String> imageUrls = images.stream().map(ProductInfoImage::getImageUrl).toList();
 
-        ProductNutrition productNutrition = productNutritionRepository.findById(id).orElseThrow(() -> new GeneralException(PRODUCT_NUTRITION_NOT_EXISTED));
+        ProductNutrition productNutrition = productNutritionRepository.findByProduct(product).orElseThrow(() -> new GeneralException(PRODUCT_NUTRITION_NOT_EXISTED));
 
         return ProductConverter.toProductDetailDto(product, imageUrls, productNutrition);
     }