Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Wed, 25 Jan 2017 16:40:45 +0100] rev 1784
fold: cleanly abort on empty fold set (issue5453)
We now handle the empty set case, cleanly aborting instead of crashing with a
traceback. The message used match the output of 'hg push' in similar situation.