'Send a NOOP command asking the server to do nothing but respond.
@rtype: L{Deferred <defer.Deferred>} which successfully fires with
L{bytes} or fails with L{ServerErrorResponse}
@return: A deferred which fires when the server response is received.
On an OK response, the deferred succeeds with the server
response minus the status indicator.  On an ERR response, the
deferred fails with a server error response failure.'

def noop(self):

    return self.sendShort('NOOP', None)
