修复删除连接客户端时会崩溃的异常

ViewModels/MainWindowViewModel.cs

@@ -259,7 +259,7 @@ namespace OnlineUserPool.ViewModels
 
         private void SendMessage(Collection<HostModel> clients, List<MsgModel> msgModels)
         {
-            if (!clients.Any())
+            if (!clients.Any() || !msgModels.Any())
             {
                 return;
             }
@@ -405,16 +405,23 @@ namespace OnlineUserPool.ViewModels
         }
 
         private void CientDisconnected(EndPoint point)
+        {            
+            dispatcher.Invoke(() =>
+            {
+                try
                 {
                     var client = Clients.FirstOrDefault(f => f.IPEndPoint.ToString() == point.ToString());
                     if (client != null)
-            {
-                dispatcher.Invoke(() =>
                     {
                         Clients.Remove(client);
-                });
                     }
                 }
+                catch(Exception ex)
+                {
+                    Log.Information("在CientDisconnected触发以后，删除client时报错了,"+ ex.Message +", " + ex.StackTrace);
+                }
+            });
+        }
     }
 
     public class Data1