magit-insert-status-headers/magit-rev-format doesn't handle upstream gone

[Silex]

See #1739 for more details.

Basically in magit-insert-status-headers, there is the following lines:

              (setq line (or (magit-rev-format "%h %s" upstream) ""))
              (string-match "^\\([^ ]+\\) \\(.*\\)" line)
              (magit-bind-match-strings (hash msg) line

This fails when the upstream was deleted.

I think the following should be enough to reproduce:

git checkout -b foo
git push -u origin foo
git push origin :foo
emacs -f magit-status

I would have liked to fix it myself but I can't figure out what to do 😞

[npostavs]

I think this is a duplicate of #1723, there is a proposed patch in the comments there.

[Silex]

Oh, nice!