rails/rails — pull request #11437 by kennyj (2013-07-14 17:15:52+00:00)
Title: Fix default rendered format problem when calling render method without :content_type option.

Closes #11393.

Please see #11393.
If we call `render` method with :inline option only (without :content_type), the rendered format is :zip.
It seems that this behavior is bad.

/cc @steveklabnik @GBH @glebm