Workaround for improperly imported courses which have an enrolment_date but no start_date
Workaround for improperly imported courses which have an enrolment_date but no start_date

sdc-webteam-deploy/leap,sdc-webteam-deploy/leap,sdc/leap,sdc-webteam-deploy/leap,sdc/leap,sdc-webteam-deploy/leap,sdc/leap,sdc/leap