Fix precondition in SingleColumnParser and ScalarColumnParser
Fix precondition in SingleColumnParser and ScalarColumnParser

DanielGrech/anko,mr-max/anko,mr-max/anko,JetBrains/anko,deva666/anko,DanielGrech/anko,fboldog/anko,leasual/anko,Ribesg/anko,colriot/anko,deva666/anko,mr-max/anko,snice/anko,JetBrains/anko,Ribesg/anko,is00hcw/anko,colriot/anko,JetBrains/anko,fboldog/anko,snice/anko,deva666/anko,DanielGrech/anko,snice/anko,leasual/anko,colriot/anko,is00hcw/anko,fboldog/anko,Kotlin/anko,Kotlin/anko,leasual/anko,Kotlin/anko,is00hcw/anko,Ribesg/anko