fix for expected arg 3

websocket/_app.py

@@ -188,14 +188,13 @@ class WebSocketApp(object):
         """ this functions extracts the code, reason from the close body
         if they exists, and if the self.on_close except three arguments """
         import inspect
+        if not self.on_close and len(inspect.getargspec(self.on_close).args) == 3:
+            return []
         if data and len(data) >=2:
             code = 256*six.byte2int(data[0]) + six.byte2int(data[1])
             reason = data[2:].decode('utf-8')
-            if self.on_close and len(inspect.getargspec(self.on_close).args) == 3:
                 return [code,reason]
-            else:
-                return []
-        return []
+        return [None,None]
 
     def _callback(self, callback, *args):
         if callback: