Comment 2 for bug 1835029

We figured out the issue is reproducible with a certain content of ovn NB db. We have the DB backup and when northd is started, the issue is reproduced. It doesn't reproduce if we comment out this call https://github.com/openvswitch/ovs/blob/master/ovn/northd/ovn-northd.c#L2581 that adds a value to nat_addresses row.