Handle empty course rosters (#1499)
Handle empty course rosters (#1499)

* Handle empty rosters

* Add blank line after guard clause
cg2v/Autolab,cg2v/Autolab,cg2v/Autolab,cg2v/Autolab,autolab/Autolab,autolab/Autolab,cg2v/Autolab,autolab/Autolab,autolab/Autolab,autolab/Autolab,autolab/Autolab,cg2v/Autolab