nicklockwood/FXForms — pull request #69 by bartvandendriessche (2014-04-15 15:32:10+00:00)
Title: Fix crash that occurs when FXFormFieldKey is absent

`NSManagedObject` overrides `respondsToSelector:` in such a way that it crashes when `nil` is passed in.

This commit fixes the two spots where respondsToSelector is called with a possible nil value.

This fixes #42