fix: 加入购物车skuid可选

src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java

@@ -368,7 +368,7 @@ public class CartService {
             // 商品备注
             String note = jsonObject.getString("note");
             if (StringUtils.isBlank(shopId) || StringUtils.isBlank(productId)
-                    || StringUtils.isBlank(skuId) || type == null || buyNum == null) {
+                    || type == null || buyNum == null) {
                 return Result.fail("参数缺失");
             }