!76 fix 优惠券指定商品或类型时，需要判断购物车里有

Merge pull request !76 from regox/N/A

Author: linlinjava

litemall-db/src/main/java/org/linlinjava/litemall/db/service/CouponVerifyService.java

@@ -95,7 +95,7 @@ else if(timeType.equals(CouponConstant.TIME_TYPE_DAYS)) {
                 }
             }
             //是否达到优惠券满减金额
-            if (total.compareTo(coupon.getMin()) == -1) {
+            if (goodsValueList.isEmpty() || total.compareTo(coupon.getMin()) == -1) {
                 return null;
             }
         }