Fixed bug with non-displayed download button

app/views/projects/_clone_panel.html.haml

@@ -4,7 +4,7 @@
       .form-horizontal= render "shared/clone_panel"
     .span4.pull-right
       .pull-right
-        - if @project.empty_repo?
+        - unless @project.empty_repo?
           - if can? current_user, :download_code, @project
             = link_to archive_project_repository_path(@project), class: "btn-small btn grouped" do
               %i.icon-download-alt