Add pdf handling in render_respond_to_format_with_error_message

[aaronskiba]

Fixes #3414

• #3414

Changes proposed in this PR:

• render_respond_to_format_with_error_message is called both when rescuing from Pundit::NotAuthorizedError and ActiveRecord::RecordNotFound. The method works properly with .html format, but prior to this change, ActionController::UnknownFormat was thrown for .pdf format.