Dynamic DNS - Hostname should not be required for DNS-O-Matic
Background: DNS-O-Matic allows updates to be sent without a hostname or service specified, in which case all services are updated. However, the pfSense UI requires a valid hostname, and will not allow this case.
I hacked out all hostname validation to test the underlying update mechanism, forced an update, and verified on the DNS-O-Matic site that all services were updated. This suggests that only the UI validation needs to be updated.