覆盖旧值

@@ -4,9 +4,6 @@ import com.google.common.base.Joiner;
 import com.yoho.error.exception.ServiceException;
 import com.yoho.ufo.coupon.model.CouponAndProductConditions;
 import com.yoho.ufo.coupon.model.ProductCondition;
-
-import static com.yoho.ufo.coupon.model.ProductLimitType.*;
-
 import com.yoho.ufo.coupon.model.ProductLimitType;
 import com.yoho.ufo.coupon.util.Strings;
 import com.yoho.ufo.model.coupon.Coupon;
@@ -22,6 +19,9 @@ import java.util.List;
 import java.util.Objects;
 import java.util.UUID;
 
+import static com.yoho.ufo.coupon.model.ProductLimitType.Exclude_Product;
+import static com.yoho.ufo.coupon.model.ProductLimitType.Specific_Product;
+
 public class CouponAndProductConditionsBuilder {
 
     private static final String SKUP_FORBID_TYPE_NONE = "0";
@@ -82,7 +82,7 @@ public class CouponAndProductConditionsBuilder {
             case Specific_Product:
             case Exclude_Product:
             case ALL:
-                coupon.setProductLimitValue(null);
+                coupon.setProductLimitValue("");
                 break;
             case Specific_Brand:
             case Specific_Series: