Hides create list button when not logged in

app/views/shared/issuable/_filter.html.haml

@@ -29,7 +29,7 @@
         .pull-right
           - if controller.controller_name != 'boards'
             = render 'shared/sort_dropdown'
-          - else
+          - elsif current_user
             .dropdown
               %button.btn.btn-create.js-new-board-list{ type: "button", data: { toggle: "dropdown", labels: labels_filter_path } }
                 Create new list