When calculating maxima for a dive, we need to take data from all existing
dive computer structures plus potentially also a fake dive computer
structure that is just passed in in order to create a meaningful profile.
Commit 86c961614b ("Actually walk all dive computers, don't just claim
to do so") missed that second case and no longer took the fake_dc into
account, breaking the display of dives that don't have samples.
Reported-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>