Fix: extendedEnum breaks JSONSchema parsing (#4774)
Fix: extendedEnum breaks JSONSchema parsing (#4774)

(probably due to Python 3 migration)
alexanderlz/redash,getredash/redash,denisov-vlad/redash,getredash/redash,getredash/redash,denisov-vlad/redash,getredash/redash,denisov-vlad/redash,getredash/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash