Currently when trying to erase the ipaDomainResolutionOrder attribute we hit an internal error as the split() method is called on a None object. By returning early in case of empty string we now allow removing the ipaDomainResolutionOrder attribute by both calling delattr or setting its value to an empty string. https://pagure.io/freeipa/issue/6825 Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-By: Martin Basti <mbasti@redhat.com>