code-dot-org/code-dot-org — pull request #555 by Bjvanminnen (2014-11-25 22:47:24+00:00)
Title: better error on unknown apps

May not be super valuable investing in the gruntfile as we move to rake, but if we still want to be able to build single apps, this will be useful.

This gives a better bug when we do something like MOOC_APP=artist (not a real app) instead of MOOC_APP=turtle.