Better messaging and better rule implementation

Websockets/ConnectionInstance.cs

@@ -1,5 +1,6 @@
 using System.Net.WebSockets;
 using System.Text;
+using Newtonsoft.Json;
 
 namespace MauMau_Server.Websockets;
 
@@ -7,6 +8,7 @@ public class ConnectionInstance
 {
     public Guid Id { get; set; }
     public string Name { get; set; }
+    [JsonIgnore]
     public WebSocket Socket { get; set; }
     
     public ConnectionInstance(string name, Guid id, WebSocket socket)

Websockets/WebsocketManager.cs

@@ -16,6 +16,9 @@ public static class WebsocketManager
     
     public static async void CloseAsync(WebSocket webSocket, WebSocketReceiveResult result)
     {
-        await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
+        if (webSocket.State is WebSocketState.Open or WebSocketState.CloseReceived or WebSocketState.CloseSent)
+        {
+            await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
+        }
     }
 }