Fix dive computer event handling if there are no samples

This actually triggers for one of our insane test dives (test15): it has
no samples, so we created a fake dive computer entry with the a fake
profile in it, but we didn't copy the events over.

Having a dive with no samples, yet having events from the dive computer,
sounds pretty bogus.  But that test-case did show that when that bogus
situation happens, we had two independent buglets: (a) we didn't insert
the entries in the fake dive computer entry we used and (b) we would
then mix up the events of the fake dive computer entry with the first
dive computer of a dive.

Fix this, just to make test15 happy again.  And eventually, when we
actually plot the information for multiple dive computers, fixing case
(b) would become necessary even for real dives.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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