Bandaid fix for crash when Department.upcoming thinks there are upcoming sessions, but topic.upcoming_sessions does not.
Bandaid fix for crash when Department.upcoming thinks there are upcoming sessions, but topic.upcoming_sessions does not.

txstate-etc/signup,txstate-etc/txst-signup,txstate-etc/signup,txstate-etc/signup,txstate-etc/txst-signup,txstate-etc/txst-signup