Our git repository viewer has stopped working since we have upgraded to redmine 2.3.0 (and rails 3.2.13).

The message is "404 The entry or revision was not found in the repository." and the accompanying log message is:

Started GET "/projects/knot-dns/repository" for 109.81.193.205 at 2013-03-20 19:25:24 +0100
Processing by RepositoriesController#show as HTML
  Parameters: {"id"=>"knot-dns"}
  Current user: oerdnj (id=3)
  Rendered common/error.html.erb within layouts/base (0.2ms)
Completed 404 Not Found in 208ms (Views: 151.5ms | ActiveRecord: 11.6ms)

Our current environment is:

Ruby version              1.9.3 (x86_64-linux)
RubyGems version          1.8.11
Rack version              1.4
Rails version             3.2.13
Active Record version     3.2.13
Action Pack version       3.2.13
Active Resource version   3.2.13
Action Mailer version     3.2.13
Active Support version    3.2.13
Middleware                Rack::Cache, ActionDispatch::Static, Rack::Lock, #, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport, OpenIdAuthentication
Application root          /usr/share/redmine
Environment               production
Database adapter          postgresql
Database schema version   20130217094251