github/ReactiveCocoa — pull request #165 by jspahrsummers (2012-12-03 07:52:16+00:00)
Title: Document that -sendError: can be given nil

I started #160 expecting to find some places where we weren't handling `nil` errors correctly, but it actually looks all good.

I don't think there's any way to test that sort of thing in a truly generic way, but I did add a small test for any `` implementors, just verifying that they don't do terrible things when sent `nil` errors.