Handle socket disonnects

Gameboard.ShogiUI.Sockets/Managers/SocketCommunicationManager.cs

@@ -68,6 +68,12 @@ namespace Gameboard.ShogiUI.Sockets.Managers
         {
           logger.LogError(ex.Message);
         }
+        catch(WebSocketException ex)
+        {
+          logger.LogInformation($"{nameof(WebSocketException)} in {nameof(SocketCommunicationManager)}.");
+          logger.LogInformation("Probably tried writing to a closed socket.");
+          logger.LogError(ex.Message);
+        }
       }
       UnsubscribeFromBroadcastAndGames(userName);
     }