evolve: add test to demonstrate a bug when active topic is empty
Added test shows that when current active topic is empty and we try
to run `hg up`, it fails with an error. It's because this case is not
correctly handled when we find a destination to update (when topics
are in play)
Next patch will fix this.
# Copyright 2019 Pierre-Yves David <pierre-yves.david@octobus.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
def hastopicext(repo):
"""True if the repo use the topic extension"""
return getattr(repo, 'hastopicext', False)