Berthold Stoeger e434b5aa40 Cleanup: introduce DiveTripModelBase::IS_TRIP_ROLE
To test whether an entry is a trip, we passed a pointer to the
trip through a QVariant and tested that for null-ity.

Passing pointers through QVariants has given us myriads of
problems in QML, therefore introduce a bool IS_TRIP_ROLE

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2019-11-11 22:44:58 +01:00
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