Small refactor
Small refactor

If `payment_method` is nil then #process! will end up doing nothing. I
think this makes that clearer.

pervino/solidus,pervino/solidus,forkata/solidus,devilcoders/solidus,ckk-scratch/solidus,grzlus/solidus,scottcrawford03/solidus,lsirivong/solidus,scottcrawford03/solidus,athal7/solidus,grzlus/solidus,jordan-brough/solidus,richardnuno/solidus,athal7/solidus,bonobos/solidus,xuewenfei/solidus,pervino/solidus,xuewenfei/solidus,richardnuno/solidus,scottcrawford03/solidus,jordan-brough/solidus,jordan-brough/solidus,jsurdilla/solidus,lsirivong/solidus,ckk-scratch/solidus,jsurdilla/solidus,xuewenfei/solidus,devilcoders/solidus,ckk-scratch/solidus,scottcrawford03/solidus,grzlus/solidus,devilcoders/solidus,athal7/solidus,athal7/solidus,devilcoders/solidus,richardnuno/solidus,forkata/solidus,xuewenfei/solidus,grzlus/solidus,Arpsara/solidus,Arpsara/solidus,bonobos/solidus,bonobos/solidus,jordan-brough/solidus,jsurdilla/solidus,lsirivong/solidus,bonobos/solidus,Arpsara/solidus,Arpsara/solidus,lsirivong/solidus,jsurdilla/solidus,pervino/solidus,richardnuno/solidus,forkata/solidus,forkata/solidus,ckk-scratch/solidus