Added exception handling to Avalonia Transport layer

PRS.Avalonia/PRS.Avalonia/TransportLayer.cs

@@ -48,6 +48,7 @@ public class TransportLayer : ObservableObject
         _transport = new RpcClientSocketTransport(urls);
         _transport.OnOpen += (_, _) => DoConnected();
         _transport.OnClose += (_, _) => DoDisconnected();
+        _transport.OnException += (_, _) => DoDisconnected();
 
         ClientFactory.SetClientType(typeof(RpcClient<>), Platform.TimeBench, "Avalonia", _transport);