mobile: prevent crash adding dives

When the cylinders became a dynamic data structure, a get_cylinder() call
suddenly could return a NULL pointer. So use get_or_create_cylinder() for the
first call when parsing the user's data.

Also, deal with an oddity where the string lists look different because an
empty list technically isn't the same as a list with one empty string.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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