QSqlTableModel and NULL

[karas]

Hi,
the following code

for (QList<QModelIndex>::iterator it = currentSelection.begin(); it != currentSelection.end(); ++it)
{
    bool res = messengersModel->removeRow(it->row());
    this->setRowHidden(it->row(), true);
}

for (QList<QModelIndex>::iterator it = currentSelection.begin(); it != currentSelection.end(); ++it)
{
    bool res = messengersModel->removeRow(it->row());
    this->setRowHidden(it->row(), true);
}

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deletes row from the MySql table if there's no NULL values in the given record. But, if some of the columns contain NULL value, that row is not deleted by QSqlTableModel::removeRow(). Why? Is it possible to force QSqlTableModel to delete row even if it contains NULL?
Thanks