Respond with 404 instead of 500 when revision/entry is not found in the repository (#7307).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4710 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/repositories_controller.rb

@@ -226,7 +226,7 @@ class RepositoriesController < ApplicationController
   end
 
   def show_error_not_found
-    render_error l(:error_scm_not_found)
+    render_error :message => l(:error_scm_not_found), :status => 404
   end
   
   # Handler for Redmine::Scm::Adapters::CommandFailed exception