[PyQt] Nullable foreign keys

[Catriona Johnson]

Hello

I have a QSqlRelationalTableModel which is viewed using a QTableView
and QSqlRelationalDelegate to give comboboxes for foreign key fields.

My question is how do I handle nullable foreign keys? If a foreign key
is null for a particular record/row it is not being displayed in the
QTableView and there seems to be no way of having a null value in a
combo box.

I could have a null value in the related table but I don't really want
to do this

Thanks in advance