scripts/rethinkdb: active courses, robust against missing host fields; tweaking how db connections are displayed
scripts/rethinkdb: active courses, robust against missing host fields; tweaking how db connections are displayed

sagemathinc/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,sagemathinc/smc