Check existance of a revision and respond with 404 if it doesn't exist.

app/controllers/wiki_controller.rb

@@ -298,6 +298,9 @@ class WikiController < ApplicationController
 
   def get_page_and_revision
     @revision = @page.revisions[@params['rev'].to_i]
+    if @revision.nil?
+      render_text 'Page name is not specified', '404 Not Found'
+    end
   end
 
   def parse_category

test/functional/wiki_controller_test.rb

@@ -371,6 +371,11 @@ class WikiControllerTest < Test::Unit::TestCase
     assert_equal @home.revisions[0], r.template_objects['revision']
   end
   
+  def test_non_existant_revision_of_existing_page
+    r = process 'revision', 'web' => 'wiki1', 'id' => 'HomePage', 'rev' => '5'
+    assert_response :missing
+  end
+  
 
   def test_rollback
     # rollback shows a form where a revision can be edited.