reciprocity/ggrc-core — pull request #882 by SilasX (2014-01-10 20:48:33+00:00)
Title: Objective not required in PBC import interface #63636498

Per [story 63636498](https://www.pivotaltracker.com/story/show/63636498). Warns user if there's no Objective, throws error if Objective slug is invalid. Unit test coverage for this new behavior.