rebase: handle the case when nothing to rebase (dry-run)...
rebase: handle the case when nothing to rebase (dry-run)
In dry-run mode, even when there was no rebase in progress it tried
to abort (for context, at the end of dry-run mode we abort the in-memory
performed rebase) because we were not early checking if there was any rebase
started.
Changes in test file reflect the fixed behavior.
Differential Revision:
https://phab.mercurial-scm.org/D9659