Fix TaxRate#adjust under rails 4.1.10
Fix TaxRate#adjust under rails 4.1.10

Rails 4.1.10 has a regression when running a query with

  where(polymorphic_association: [])

 To get around this we can just skip the query entirely.

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