Fix layout for empty project

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/empty.html.haml

+- @no_container = true
+
 = content_for :flash_message do
   - if current_user && can?(current_user, :download_code, @project)
     = render 'shared/no_ssh'
@@ -17,6 +19,7 @@
       file to this project.
 
 - if can?(current_user, :download_code, @project)
+  %div{ class: container_class }
     .prepend-top-20
     .empty_wrapper
       %h3.page-title-empty