Berthold Stoeger 8a33c04894 Cleanup: use DiveTripModelBase::clear() to reset the log
Introduce a DiveTripModelBase::clear() function that cleanly
clears all dive data inside a beginResetModel()/endResetModel()
pair. Thus, the UI will be cleanly reset and we can remove
explicit calls to
 - graphics->setEmptyState()
 - mainTab->clearTabs()
 - mainTab->clearTabs()
 - diveList->reload()
from MainWindow::closeCurrentFile().

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2019-11-16 08:29:53 -08:00
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