unittest 0.7.1 fails (exitcode 1) when there are no errors

[GoogleCodeExporter]

What steps will reproduce the problem?
1. per issue 84

What is the expected output? What do you see instead?
The build should complete successfully.
The build does not report errors, but the exit code is 1.
https://travis-ci.org/wikimedia/pywikibot-core/jobs/39676784

What version of the product are you using? On what operating system?
Ubuntu

Please provide any additional information below.

https://bugzilla.wikimedia.org/show_bug.cgi?id=72801

Original issue reported on code.google.com by [email protected] on 1 Nov 2014 at 12:18