#508 pam -R 0 is broken

[Willem van Straten]

e.g.

$ pam -R 0 file.ar -m

Error::stack
        Pulsar::Archive::unload
        Pulsar::Archive::verify
        Pulsar::DeFaradayed::apply
Error::InvalidState
Error::message
        Archive::faraday_corrected is set and Integration[0]
        has no DeFaraday Extension

[Willem van Straten]

commit e6bfb590a651d8ac108a92b40896d583f72363b4
Author: Willem van Straten vanstraten.willem@gmail.com
Date: Tue Nov 25 06:36:57 2025 +1300

bugs/508 record the correction of relative DM/RM, even if it is zero