Fix deleting branches without upstream

[MontakOleg]

See #705 for details

[spacewander]

@MontakOleg
Maybe we could use git config branch.$branch.remote || echo 'origin' and git branch -D ... || continue to achieve the same result, without removing the set -e?

[MontakOleg]

I will try

[MontakOleg]

git branch -D ... || continue will skip deleting remote branch, if local branch does not exists. This is expected behavior?

And what we want to do if git branch -d -r $remote/$branch fails?

I would prefer to try delete remote branch even if there no local branch.

[spacewander]

@MontakOleg
Well, we could use git branch -D ... || true instead?
In my opinion, we could use || continue with git branch -d -r $remote/$branch. If we failed to delete the remote tracking branch locally, we don't need to push the change to the remote.

[MontakOleg]

@spacewander
Look at this, please.

[spacewander]

@MontakOleg
Merged. Thank you!