rails/rails — pull request #13103 by acapilleri (2013-11-29 13:55:21+00:00)
Title: Fix header Content-Type: #<Mime::NullType:...> in localized template

This PR fixes #13064 regression bug introduced by the #8085

Ideally the NullType object would act like NilClass unfortunately
that appears to be hardwired into MRI, as we know nil.to_a -> []