bugfix：目录订阅收到更新事件时，sql字段update_time为空导致的报错

lishuyuan

2023-11-02 8bd2f47c9a92ffcf5ae43fae965eaefd4748e263

 src/main/java/com/genersoft/iot/vmp/service/impl/DeviceServiceImpl.java

@@ -546,6 +546,8 @@
            }
        }else if (device.getSubscribeCycleForMobilePosition() == 0) {
            if (deviceInStore.getSubscribeCycleForMobilePosition() != 0) {
                deviceInStore.setMobilePositionSubmissionInterval(device.getMobilePositionSubmissionInterval());
                deviceInStore.setSubscribeCycleForMobilePosition(device.getSubscribeCycleForMobilePosition());
                // 取消订阅
                removeMobilePositionSubscribe(deviceInStore);
            }