fix 默认值

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

@@ -190,6 +190,7 @@ public class DeviceService : IDeviceService
                     DeviceUniqueNo = entity.UniqueNo,
                     Type = DeviceUploadLogTypeEnumType.Raise,
                     UserUniqueNo = string.Empty,
+                    SerialNo = string.Empty,
                     RaiseDateTime = entity.CreateTime,
                 });
             }

Src/Dlhis.Entity/Device/Entities/DeviceUploadLogEntity.cs

@@ -12,7 +12,7 @@ namespace Dlhis.Entity.Device.Entities;
 public class DeviceUploadLogEntity : SugarBaseEntity, ITenantId
 {
     [SugarColumn(IsNullable = false)]
-    public string SerialNo { get; set; }
+    public string SerialNo { get; set; } = string.Empty;
 
     /// <summary>
     /// 设备code