reciprocity/ggrc-core — pull request #1046 by SilasX (2014-02-20 18:02:00+00:00)
Title: Change warning to error on malformed date. #65972524

Per [story 65972524](https://www.pivotaltracker.com/story/show/65972524). Invalid dates were always accepted (with conversion to null) with a warning; now they are (import-blocking) errors.