Avoid error on stderr with older git
commitc6e458380e674adaabb61ef3b2ae5c2c3aca16f4
authorOlly Betts <olly@survex.com>
Sun, 30 Sep 2018 22:37:53 +0000 (1 11:37 +1300)
committerOlly Betts <olly@survex.com>
Sun, 30 Sep 2018 22:37:53 +0000 (1 11:37 +1300)
treea2691674cd1e4f7f30763aafa28c48ff889f93f5
parent87e057e8645969967e253dedfa63ffd0f5d19b01
Avoid error on stderr with older git

Discard stderr when trying to use git worktree, which is a fairly recent
addition.
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