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Guard against querying the git hash when git repository information is not present.

Alex Buccherirequested to merge
fix_git_hash_cmake_error into hotfix-16.1

mock_autotools.cmake runs git log -1 --format=%h to determine the git hash variable set in config.h.in. This is ultimately displayed when running Octopus (see print_header() in utils.F90).

For packaged releases, which strip out the git information, cmake returns the error:

fatal: not a git repository (or any parent up to mount point /)

This does not affect configuration, but it is confusing to the user. As such, I've added a guard such that this call is only made if .git is present.

This closes issue #1197 (closed)

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