Forcing on a non-buildbot repo causes a python error

[jdm]

There are two uses of res in

homu/homu/main.py

Lines 581 to 593 in dfefeb7

	if 'buildbot' in repo_cfg:
	with buildbot_sess(repo_cfg) as sess:
	res = sess.post(
	repo_cfg['buildbot']['url'] + '/builders/_selected/stopselected', # noqa
	allow_redirects=False,
	data={
	'selected': repo_cfg['buildbot']['builders'],
	'comments': INTERRUPTED_BY_HOMU_FMT.format(int(time.time())), # noqa
	})
	if 'authzfail' in res.text:
	err = 'Authorization failed'
	else:
	mat = re.search('(?s)<div class="error">(.*?)</div>', res.text)

that can trigger exceptions if the repo does not use buildbot.