Show README link only if repository exists and not empty

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

app/views/projects/_home_panel.html.haml

@@ -21,7 +21,7 @@
         - if can?(current_user, :admin_project, @project)
           –
           %strong= link_to 'Edit', edit_project_path
-        - elsif @repository.readme
+        - elsif !@project.empty_repo? && @repository.readme
           - readme = @repository.readme
           = link_to project_blob_path(@project, tree_join(@repository.root_ref, readme.name)) do
             = readme.name