Fix: correctly call CustomModelConverter __init__.
Fix: correctly call CustomModelConverter __init__.

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