feat：修改停车劵过期流程逻辑

mallinkService/src/main/java/com/iformall/domain/po/WxCoupon.java

@@ -526,10 +526,12 @@ public class WxCoupon extends TenantEntity {
 	        valid_date = DateUtils.getTimeAfterDays(limit_days, curr);
 	    } else if (this.getValidType().equals(EnumCouponValidType.TIME_AND_DAYS.getCode())) {
 			// 时间范围和过期天数共存，最终过期时间以最小的为主
-			int limit_days = this.getValidDays();
-			valid_date = limit_days != 0 ?  DateUtils.getTimeAfterDays(limit_days, curr) : DateUtils.getDayEnd(curr);
-			if (this.getValidEndDate().before(valid_date)) {
+			Integer limit_days = this.getValidDays();
+			if (limit_days == null) {
 				valid_date = this.getValidEndDate();
+			} else {
+				valid_date = limit_days != 0 ?  DateUtils.getTimeAfterDays(limit_days, curr) : DateUtils.getDayEnd(curr);
+				valid_date = this.getValidEndDate().before(valid_date) ? this.getValidEndDate() : valid_date;
 			}
 		} else {
 			//永久有效