lisa.git: Cleanup find_shortes_symref
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Drop compat for git older than 2.7 as we don't support anything before Ubuntu Xenial 16.04.
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Raise an exception when no symbolic reference can be found.
Drop compat for git older than 2.7 as we don't support anything before Ubuntu Xenial 16.04.
Raise an exception when no symbolic reference can be found.