Fix errors for ProductInfo when product has no variants
Fix errors for ProductInfo when product has no variants

jreigel/saleor,mociepka/saleor,jreigel/saleor,maferelo/saleor,car3oon/saleor,HyperManTT/ECommerceSaleor,UITools/saleor,UITools/saleor,itbabu/saleor,maferelo/saleor,mociepka/saleor,KenMutemi/saleor,KenMutemi/saleor,UITools/saleor,itbabu/saleor,tfroehlich82/saleor,jreigel/saleor,KenMutemi/saleor,maferelo/saleor,tfroehlich82/saleor,HyperManTT/ECommerceSaleor,UITools/saleor,mociepka/saleor,HyperManTT/ECommerceSaleor,car3oon/saleor,car3oon/saleor,itbabu/saleor,UITools/saleor,tfroehlich82/saleor