render merge request tabs regardless of commit history

app/views/projects/merge_requests/_show.html.haml

@@ -50,7 +50,6 @@
     .content-block.content-block-small
       = render 'award_emoji/awards_block', awardable: @merge_request, inline: true
 
-    - if @commits_count.nonzero?
     .merge-request-tabs-holder{ class: ("js-tabs-affix" unless ENV['RAILS_ENV'] == 'test') }
       %div{ class: container_class }
         %ul.merge-request-tabs.nav-links.no-top.no-bottom