fix 设备不存在判断

Src/Dlhis.Basic/Device/Services/Implements/DevicePermissionService.cs

@@ -303,6 +303,7 @@ public class DevicePermissionService : IDevicePermissionService
     public async Task<Pagination<DeviceGainfoResponse>> GetGainfoPageByDeviceAsync(DeviceWithGainfoRequest request)
     {
         var device = await _dbContext.Queryable<DeviceEntity>().Where(x => x.UniqueNo == request.DeviceUniqueNo).SingleAsync();
+        device.ThrowIfNull("设备不存在");
         var departments = await _dbContext.Queryable<DepartmentEntity>().ToListAsync();
 
         //当前设备的分组