Squashing a single commit can be selected, but fails (without clear reason)
Summary
Squashing a single commit can be selected, but it fails.
Steps to reproduce
Try to squash a merge request with only 1 changeset.
Example Project
What is the current bug behavior?
The squash fails.
What is the expected correct behavior?
The squash should do nothing.
Relevant logs and/or screenshots
Mercurial returns return code 1 in this specific case (which is not handled separately by Heptapod?).
Details about the Heptapod instance where the bug occurs
foss.heptapod.net
Possible fixes
Adapt to accept return code 1 for this case.