subsurface/subsurface-core
Dirk Hohndel c7c9fb0bb0 Git storage: be more careful when checking if this SHA is already loaded
In commit 8c1cc4524d19 ("Don't reload identical data") I got a little
carried away. Before comparing SHAs we need to make sure that
a) this is a git repository at all
b) we have an actual SHA before we claim to have the data loaded

Reported-by: Paul-Erik Törrönen <poltsi@777-team.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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