fix 处理营业点分配功能问题

Src/Dlhis.Basic/BusinessShift/Request/BusinessPlaceShiftSaveMealShiftRequest.cs

@@ -27,6 +27,7 @@ public class BusinessPlaceShiftSaveMealShiftRequest : IValidatableObject
     /// <summary>
     /// 时间段
     /// </summary>
+    [Required(ErrorMessage = "时间段不可为空")]
     public TimePeriod TimePeriod { get; set; }
 
 
@@ -37,14 +38,14 @@ public class BusinessPlaceShiftSaveMealShiftRequest : IValidatableObject
             yield return new ValidationResult("时间段配置错误", new[] { nameof(TimePeriod) });
         }
 
-        if (TimePeriod?.Start == null || TimePeriod?.End == null)
+        if (TimePeriod!.Start == null || TimePeriod!.End == null)
         {
             yield return new ValidationResult("时间段配置错误", new[] { nameof(TimePeriod) });
         }
 
-        if (TimePeriod.Start == TimePeriod.End)
+        if (TimePeriod!.Start == TimePeriod!.End)
         {
             yield return new ValidationResult("时间段设置区间有误,开始时段不能等于结束时段.", new[] { nameof(TimePeriod) });
         }
     }
-}
+}