Fixed a nasty bug that caused Instiki to go into an endless loop on call to /wiki/print/

app/controllers/revision_sweeper.rb

@@ -23,5 +23,9 @@ class RevisionSweeper < ActionController::Caching::Sweeper
         :action => %w(authors recently_revised list)
     expire_fragment :controller => 'wiki', :web => web.address,
         :action => %w(rss_with_headlines rss_with_content)
+    WikiReference.pages_that_reference(page.name).each do |ref|
+      expire_action :controller => 'wiki', :web => web.address,
+          :action => %w(show published), :id => ref.page.name
+    end
   end
 end

app/controllers/wiki_controller.rb

@@ -156,6 +156,9 @@ class WikiController < ApplicationController
   end
 
   def print
+    if @page.nil?
+      redirect_home
+    end
     @link_mode ||= :show
     @renderer = PageRenderer.new(@page.revisions.last)
     # to template