ActionView::PathSet .exists? fails due to nil array

Probably needs a bit more information to write a failing test-case. The fix in itself looks easy enough.

You could submit any value to view_paths.exists? and it will fail.

Here is my example. I am using a pages_controller, to manage my static pages. Before attempting to load a template, I want my app to ensure the template exists, using a before filter.

class PagesController < ApplicationController
  unloadable
  before_filter :ensure_valid

  def show
    render :template => current_page
  end

  protected

  def ensure_valid
    unless view_paths.exists?(current_page)
      render :nothing => true, :status => 404 and return false
    end
  end

  def current_page
    "pages/#{params[:id].to_s.downcase}"
  end
end