基类租户id改为可为空

MicroServices/Business/Business.Domain/StructuredDB/Base/BaseEntity.cs

@@ -68,7 +68,7 @@ namespace Business.Domain
         [Required]
         [Comment("租户ID")]
         [DefaultValue(1000)]
-        public virtual long tenant_id { get; set; }
+        public virtual long? tenant_id { get; set; }
 
         /// <summary>
         /// 公司ID