rails/rails — pull request #10029 by sognat (2013-04-01 13:32:04+00:00)
Title: Fixes #9654. Revert rendering behavior when format is unknown

If a request has unknown format (eg. /foo.bar), the renderer
fallbacks to default format.

This patch reverts Rails 3.2 behavior after c2267db commit.

Fixes issue #9654.