fix(BE): improve product and warehouse existence check in adjustment service

internal/modules/inventory/product-warehouses/services/product_warehouse.service.go

@@ -72,6 +72,11 @@ func (s productWarehouseService) GetAll(c *fiber.Ctx, params *validation.Query)
 		s.Log.Errorf("Failed to get productWarehouses: %+v", err)
 		return nil, 0, err
 	}
+
+	if len(productWarehouses) == 0 {
+		return nil, 0, fiber.NewError(fiber.StatusNotFound, "ProductWarehouses not found")
+	}
+
 	return productWarehouses, total, nil
 }