Fix: use String ctor function instead of toString to handle nulls
Fix: use String ctor function instead of toString to handle nulls

rockwotj/redash,pubnative/redash,hudl/redash,imsally/redash,vishesh92/redash,hudl/redash,moritz9/redash,stefanseifert/redash,vishesh92/redash,akariv/redash,ninneko/redash,pubnative/redash,imsally/redash,44px/redash,guaguadev/redash,crowdworks/redash,easytaxibr/redash,M32Media/redash,pubnative/redash,jmvasquez/redashtest,vishesh92/redash,pubnative/redash,crowdworks/redash,denisov-vlad/redash,crowdworks/redash,amino-data/redash,stefanseifert/redash,easytaxibr/redash,stefanseifert/redash,useabode/redash,imsally/redash,guaguadev/redash,ninneko/redash,useabode/redash,44px/redash,EverlyWell/redash,guaguadev/redash,getredash/redash,ninneko/redash,rockwotj/redash,guaguadev/redash,alexanderlz/redash,useabode/redash,ninneko/redash,hudl/redash,denisov-vlad/redash,getredash/redash,alexanderlz/redash,akariv/redash,vishesh92/redash,easytaxibr/redash,easytaxibr/redash,guaguadev/redash,chriszs/redash,pubnative/redash,M32Media/redash,EverlyWell/redash,M32Media/redash,useabode/redash,amino-data/redash,stefanseifert/redash,denisov-vlad/redash,akariv/redash,amino-data/redash,44px/redash,jmvasquez/redashtest,jmvasquez/redashtest,rockwotj/redash,chriszs/redash,moritz9/redash,akariv/redash,crowdworks/redash,denisov-vlad/redash,akariv/redash,chriszs/redash,getredash/redash,imsally/redash,getredash/redash,moritz9/redash,jmvasquez/redashtest,alexanderlz/redash,easytaxibr/redash,rockwotj/redash,amino-data/redash,EverlyWell/redash,44px/redash,moritz9/redash,alexanderlz/redash,stefanseifert/redash,M32Media/redash,denisov-vlad/redash,hudl/redash,getredash/redash,ninneko/redash,EverlyWell/redash,chriszs/redash,jmvasquez/redashtest