Error with n_() causes crash when 3rd argument is nil

[graaff]

undefined method `_' for GetText::TextDomainManager:Module

gettext (2.1.0) lib/gettext/runtime/textdomain_manager.rb:153:in `translate_plural_message'
gettext (2.1.0) lib/gettext.rb:180:in `n_'

This crash happens in a Rails application when the 3rd argument to n_() is nil. Line 153 should trigger a translated error, but instead I get the undefined method _() error.

Easily fixed in my code by not providing nil, but would be nice to get a proper error message.