fix ean check
fix ean check

sunny2601/spree-point-of-sale,vinsol/spree-point-of-sale,mkangia/spree-point-of-sale,romul/spree-pos,CodeCantor/spree-pos,CodeCantor/spree-pos,romul/spree-pos,mkangia/spree-point-of-sale,sunny2601/spree-point-of-sale,shingonoide/spree-pos,vinsol/spree-point-of-sale,sunny2601/spree-pos,sunny2601/spree-point-of-sale,sunny2601/spree-pos,sunny2601/spree-pos