Dirk Hohndel 03bc40194d core: don't crash on merge of non-existing dive site
While we shouldn't have a dive that references a dive site that doesn't exist,
if we do, we shouldn't crash. And a dive site that doesn't exist is most
definitely 'empty'.

Reported-by: Benjamin Fogel <nystire@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2018-07-06 22:40:18 -07:00
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