Don't display download button for dir entries (#26350).

Patch by Mischa The Evil.

git-svn-id: http://svn.redmine.org/redmine/trunk@16762 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/repositories/_navigation.html.erb

   <%= javascript_include_tag 'repository_navigation' %>
 <% end %>
 
-<% if @entry && @repository.supports_cat? %>
+<% if @entry && !@entry.is_dir? && @repository.supports_cat? %>
   <% download_label = @entry.size ? "#{l :button_download} (#{number_to_human_size @entry.size})" : l(:button_download) %>
   <%= link_to(download_label,
               {:action => 'raw', :id => @project,

test/functional/repositories_git_controller_test.rb

       assert_response :success
       assert_select 'h2 a', :text => 'sources'
       assert_select 'table.entries tbody'
+      assert_select 'div.contextual > a.icon-download', false
+
     end
 
     def test_diff