fix: 发货审核异常未回滚导致的脏数据，添加判空操作

gongchunyi

昨天 2aa97d1237b7f720b33f9952f9901ddf7ae9833a

 src/main/java/com/ruoyi/device/service/IDeviceMaintenanceService.java

@@ -15,8 +15,9 @@

    AjaxResult saveDeviceRepair(DeviceMaintenance deviceMaintenance);

    AjaxResult updateDeviceRepair(DeviceMaintenance deviceMaintenance);
    AjaxResult updateDeviceDeviceMaintenance(DeviceMaintenance deviceMaintenance);

    void export(HttpServletResponse response, Long[] ids);

    DeviceMaintenanceDto detailById(Long id);
}