Auth/LDAP: minor tweak for https://github.com/opnsense/core/pull/4784, only log message when there is one.
Auth/LDAP: minor tweak for https://github.com/opnsense/core/pull/4784, only log message when there is one.

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core