Add conditional for new pag link

app/views/projects/wikis/edit.html.haml

@@ -15,6 +15,10 @@
         Edit Page
 
     .nav-controls
+      - if !(@page && @page.persisted?)
+        - if can?(current_user, :create_wiki, @project)
+          = link_to '#modal-new-wiki', class: "add-new-wiki btn btn-new", "data-toggle" => "modal" do
+            New Page
       = render 'main_links'