git_commit_create: allow NULL parameter for update_ref#76

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Daml wants to merge 2 commits intolibgit2:developfrom Daml:fixes

Commits on Sep 10, 2014

git_commit_create: allow NULL parameter for update_ref
Damien Lelievre
committed
(+header) git_commit_create: allow NULL parameter for update_ref
Damien Lelievre
committed