reciprocity/ggrc-core — pull request #869 by SilasX (2014-01-09 01:14:22+00:00)
Title: Use of slugs in importing Requests #60841260

Per [story 60841260](https://www.pivotaltracker.com/story/show/60841260). Had to override Sluggable mixin to make `title` nullable. Also need to change the default behavior for assignee: if the uploader does not give one for an object that already exists (identified by slug), then it defaults to the existing objects's assignee value (and notifies user of such) *before* defaulting to audit contact.