Dive list: update selection after clearing model

When clearing the model the selection is cleared. Send the according
signal.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

qt-models/divetripmodel.cpp

@@ -376,6 +376,7 @@ void DiveTripModelBase::clear()
 {
 	beginResetModel();
 	clear_dive_file_data();
+	emit diveListNotifier.divesSelected({}, nullptr); // Inform profile, etc of changed selection
 	endResetModel();
 }