[Modify] Polish it

Author: sta

websocket-sharp/WebSocket.cs

@@ -1641,19 +1641,31 @@ private void messages (MessageEventArgs e)
     private void open ()
     {
       _inMessage = true;
+
       startReceiving ();
+
       try {
         OnOpen.Emit (this, EventArgs.Empty);
       }
       catch (Exception ex) {
-        _logger.Error (ex.ToString ());
-        error ("An error has occurred during the OnOpen event.", ex);
+        _logger.Error (ex.Message);
+        _logger.Debug (ex.ToString ());
+
+        error ("An exception has occurred during the OnOpen event.", ex);
       }
 
       MessageEventArgs e = null;
+
       lock (_forMessageEventQueue) {
-        if (_messageEventQueue.Count == 0 || _readyState != WebSocketState.Open) {
+        if (_messageEventQueue.Count == 0) {
           _inMessage = false;
+
+          return;
+        }
+
+        if (_readyState != WebSocketState.Open) {
+          _inMessage = false;
+
           return;
         }