pywsgi: ignore errors that happen when socket is closed (for example if it was...

pywsgi: ignore errors that happen when socket is closed (for example if it was  already closed by websocket handler)

gevent/pywsgi.py

@@ -173,8 +173,11 @@ class WSGIHandler(object):
                 self.log_request()
                 break
         finally:
+            try:
                 self.socket._sock.close()  # do not rely on garbage collection
                 self.socket.close()
+            except socket.error:
+                pass
             self.__dict__.pop('socket', None)
             self.__dict__.pop('rfile', None)
             self.__dict__.pop('wfile', None)