added null check to web socket

MediaBrowser.Server.Implementations/HttpServer/SocketSharp/WebSocketSharpListener.cs

@@ -120,7 +120,7 @@ namespace MediaBrowser.Server.Implementations.HttpServer.SocketSharp
             {
                 var endpoint = ctx.Request.RemoteEndPoint.ToString();
                 var url = ctx.Request.RawUrl;
-                var queryString = new NameValueCollection(ctx.Request.QueryString);
+                var queryString = new NameValueCollection(ctx.Request.QueryString ?? new NameValueCollection());
 
                 var connectingArgs = new WebSocketConnectingEventArgs
                 {

MediaBrowser.Server.Implementations/ServerManager/ServerManager.cs

@@ -147,7 +147,7 @@ namespace MediaBrowser.Server.Implementations.ServerManager
             {
                 OnReceive = ProcessWebSocketMessageReceived,
                 Url = e.Url,
-                QueryString = new NameValueCollection(e.QueryString)
+                QueryString = new NameValueCollection(e.QueryString ?? new NameValueCollection())
             };
 
             _webSocketConnections.Add(connection);