处理立即结束时 缺考人数结算问题

TEAMModelOS.SDK/Models/Cosmos/School/ExamInfo.cs

@@ -83,7 +83,7 @@ namespace TEAMModelOS.SDK.Models
         /// TTL删除改变状态使用
         /// </summary>
         public int? status { get; set; } = 0;
-        public double average { get; set; }
+        public double average { get; set; } = -1;
         //得分率
         public double sRate { get; set; }
         //缺考人数