This is another kind gift from the SOTA Group, that seems ignoring the importance of standards (that is more important if you consider that cluster protocol is a very old text based protocol based on strings)
sending a spot that has as "spotter" SMS_NA will break the regular expression used to parse the cluster, because SMS_NA is not a valid (or similar) to a spotter CALLSIGN.
In that case the spot was rejected as "non-spot string"
I've added a small exception to the regular expression to deal with this case, and assume spotter = spotted and setting spotter continent to the spotted callsign continent.
Change will be released with 1.24
Thanks for spotting the SMS_NA that drive me to the solution
