From: Antonio Ospite <ao2@ao2.it>
Date: Thu, 13 Dec 2018 23:15:05 +0000 (+0100)
Subject: hooks-available: avoid some errors with empty repositories
X-Git-Url: https://git.ao2.it/config/vcsh.git/commitdiff_plain/8bdae58f5b9906d57e5d4384e5fda1b93cef6aac?hp=8bdae58f5b9906d57e5d4384e5fda1b93cef6aac

hooks-available: avoid some errors with empty repositories

When entering a repository which has just been created the HEAD
reference does not exist yet  and "git read-tree -mu HEAD" would
complain loudly about that, giving a confusing error to users.

Avoid the error by checking the validity of HEAD before updating the
working tree.
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