Comment 2 for bug 619022

This is the test that allowed me to reproduce the oops based on the team's history.

class TestTeamContactAddress(TestCaseWithFactory):
    ...
    def test_setContactAddress_after_purged_mailing_list_and_rename(self):
        # This is the rare case where a list is purged for a team rename,
        # then the contact address is set/unset sometime afterwards.
        # The old mailing list address belongs the the team, but not the list.
        # 1. Create then purge a mailing list.
        list_address = self.createMailingListAndGetAddress()
        mailing_list = self.team.mailing_list
        mailing_list.deactivate()
        mailing_list.transitionToStatus(MailingListStatus.INACTIVE)
        mailing_list.purge()
        transaction.commit()
        # 2. Rename the team.
        login_celebrity('admin')
        self.team.name = 'beta'
        login_person(self.team.teamowner)
        # 3. Set the contact address.
        self.team.setContactAddress(None)
        self.assertEqual(None, self.team.preferredemail)
        self.assertEqual([], self.getAllEmailAddresses())