QSqlTableModel::removeRows() fails to remove rows with NULL values.

QSqlTableModel::removeRows() cannot delete rows with NULL values. removeRows() returns true, but a subsequent call to QSqlTableModel::submitAll() to complete the transaction returns false. This is due a bug in QSqlTableModel::deleteRowFromTable(int row) where the "whereValues" are being passed to QSqlTableModelPrivate::exec(stmt, prepStatement, rec, whereValues) as the rec values. The last line of deleteRowFromTable() reads:
return d->exec(stmt, prepStatement, whereValues);
but should read:
return d->exec(stmt, prepStatement, QSqlRecord(), whereValues);

This code change fixes the problem. The bug is demonstrated in the bug below. (Thanks to the author of QTBUG-14916, I borrowed some of his source for this bug demo)