Several fixes

[olegbbtr]

commit 7a072f1 (HEAD -> fixes, fork/fixes)
Author: Oleg Vasilev me@svin.in
Date: Sun Apr 9 16:48:30 2023 +0600

Ignore unexisting commits from meta file

This can happen when there was a rebase after git-check-rebase is done.

Signed-off-by: Oleg Vasilev <me@svin.in>

commit c5cad18
Author: Oleg Vasilev me@svin.in
Date: Sun Apr 9 16:22:35 2023 +0600

Omit absent commits during for hide_checked condition

Suppose we have a "base" range. Many commits are not present there, so this will
count as "not checked", but the truth is that those a simply not upstreamed.

Signed-off-by: Oleg Vasilev <me@svin.in>

commit 1ec7f97
Author: Oleg Vasilev oleg.vasilev@virtuozzo.com
Date: Tue Feb 28 12:11:24 2023 +0600

Fix pair unpacking during meta file parsing

If we have an extra ":" in drop or feature comment, like:
  %drop: no need: already done
The program will crash. prop.split(':', 1) will make at most 1 split.

Signed-off-by: Oleg Vasilev <oleg.vasilev@virtuozzo.com>

[olegbbtr]

@senya thoughts?