Fix 500 when accessing private project when not logged in

Gemfile.lock

@@ -928,6 +928,3 @@ DEPENDENCIES
   webmock (~> 1.21.0)
   whenever (~> 0.8.4)
   wikicloth (= 0.8.1)
-
-BUNDLED WITH
-   1.10.6

app/controllers/ci/application_controller.rb

@@ -10,9 +10,7 @@ module Ci
 
     def authenticate_public_page!
       unless project.public
-        unless current_user
-          redirect_to(new_user_sessions_path) and return
-        end
+        authenticate_user!
 
         return access_denied! unless can?(current_user, :read_project, gl_project)
       end