优惠券效验，0视为不使用优惠券

citu-module-mall/citu-module-trade-biz/src/main/java/com/citu/module/trade/service/price/calculator/TradeCouponPriceCalculator.java

@@ -41,7 +41,7 @@ public class TradeCouponPriceCalculator implements TradePriceCalculator {
     @Override
     public void calculate(TradePriceCalculateReqBO param, TradePriceCalculateRespBO result) {
         // 1.1 校验优惠劵
-        if (param.getCouponId() == null) {
+        if (param.getCouponId() == null  || 0 == param.getCouponId()) {
             return;
         }
         CouponRespDTO coupon = couponApi.validateCoupon(new CouponValidReqDTO()