Fail hard when the commit checker finds no Git repo
Fail hard when the commit checker finds no Git repo

When someone invokes the commit checker but there is no repository to
check, the script should fail hard. Currently, a warning is emitted but
the script does not fail, which leads to the warning being ignored.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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