[Rails I18n] issues with globalize code from Rails Recipes

I'm looking into using globalize for our corp intranet.  I'm following 
the instructions from the Rails Recipes book.  One issue I have come 
across involves the following snippet of code:

class ApplicationController < ActionController::Base

  after_filter :set_charset

  def set_charset
    unless @headers["Content-Type"] =~ /charset/i
      @headers["Content-Type"] ||= ""
      @headers["Content-Type"] += "; charset=utf-8"
    end
  end
end

this is directly from the book.  what i am noticing is that the response 
headers are coming back to the browser as:

Content-Type: ;charset=utf-8

notice there is no actual content-type.  if i force it to text/html

@headers["Content-Type"] ||= "text/html"

i then see that the content-type is now set correctly and rjs appears to 
still work so I am wondering if this is a typo in the code from the book 
or is it something more.

Chris

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