Chases containing only scenes would not run.
Chases containing only scenes would not run.

Chases were assuming the still-active? function returned an actual
boolean rather than a truthy value, and scenes returned just a truthy
value, so the chase would end instantly. Chases now explicitly convert
to the boolean they need. For consistency, scenes also now return a
boolean, but the real fix is in the chase code.

brunchboy/afterglow,brunchboy/afterglow,brunchboy/afterglow