If a DBus test have a problem, it still says OK

[Facundo Batista]

Doing some tests I saw this:

    test_query_by_path ... Traceback (most recent call last):
  File "/home/facundo/canonical/u1-client/review_restart-on-unknown-error/ubuntuone/syncdaemon/tools.py", line 69, in parse_reply
    *message.get_args_list()))
  File "/home/facundo/canonical/u1-client/review_restart-on-unknown-error/contrib/testing/testcase.py", line 250, in error_handler
    self.fail(error)
  File "/usr/lib/python2.6/dist-packages/twisted/trial/unittest.py", line 196, in fail
    raise self.failureException(msg)
twisted.trial.unittest.FailTest: (DBusException(dbus.String(u'Method "push_event" with signature "s(s)" on interface "com.ubuntuone.SyncDaemon.Events" doesn\'t exist\n'),),)
                                                [OK]

Beyond the problem itself, what can not happen is the test infrastructure to say "OK".