Fix submodules

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

app/helpers/submodule_helper.rb

@@ -3,7 +3,10 @@ module SubmoduleHelper
 
   # links to files listing for submodule if submodule is a project on this server
   def submodule_links(submodule_item)
-    url = submodule_item.submodule_url
+    submodule = @repository.submodules(@ref)[submodule_item.path]
+
+    url = submodule['url'] if submodule
+
     return url, nil unless url =~ /([^\/:]+\/[^\/]+\.git)\Z/
 
     project = $1