write_with_malformed_address test fails on lucid

[FAIL]: txstatsd.tests.test_client.ClientTestsBuilder_SelectReactor.test_twistedstatsd_write_with_malformed_address

Traceback (most recent call last):
  File "/home/andreas/canonical/source/txstatsd/trunk/txstatsd/tests/test_client.py", line 25, in test_twistedstatsd_write_with_malformed_address
    self.assertEqual(client.write('message'), None)
twisted.trial.unittest.FailTest: not equal:
a = 7
b = None

(5x)

Lucid's twisted accepts port "-1", that's why the above test fails:
andreas@nsn2:~$ ./test-port.py -1
port= <twisted.internet.protocol.DatagramProtocol on 65535>
andreas@nsn2:~$ cat test-port.py
#!/usr/bin/python

import sys

from twisted.internet import reactor
from twisted.internet.protocol import DatagramProtocol
from twisted.internet.interfaces import IListeningPort
port = reactor.listenUDP(int(sys.argv[1]), DatagramProtocol())

print "port=", port