Merge branch 'ph/pull-rebase-detached'

Avoids spewing error messages when using "pull --rebase" on a detached HEAD. * ph/pull-rebase-detached: git-pull: Avoid merge-base on detached head

Jeff King committed Nov 4, 2012 at 08:00 UTC 4f101a6cf41da743e40e83d045455f8c180dde88

No changes.