Fix label creation from new list for subgroup projects

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

@@ -98,7 +98,7 @@
           - if type == :boards
             - if can?(current_user, :admin_list, @project)
               .dropdown.prepend-left-10#js-add-list
-                %button.btn.btn-create.btn-inverted.js-new-board-list{ type: "button", data: { toggle: "dropdown", labels: labels_filter_path, namespace_path: @project.try(:namespace).try(:path), project_path: @project.try(:path) } }
+                %button.btn.btn-create.btn-inverted.js-new-board-list{ type: "button", data: { toggle: "dropdown", labels: labels_filter_path, namespace_path: @project.try(:namespace).try(:full_path), project_path: @project.try(:path) } }
                   Add list
                 .dropdown-menu.dropdown-menu-paging.dropdown-menu-align-right.dropdown-menu-issues-board-new.dropdown-menu-selectable
                   = render partial: "shared/issuable/label_page_default", locals: { show_footer: true, show_create: true, show_boards_content: true, title: "Add list" }

changelogs/unreleased/35181-cannot-create-label-from-board-page.yml

+---
+title: Fix label creation from new list for subgroup projects
+merge_request:
+author:

spec/features/boards/boards_spec.rb

@@ -3,7 +3,8 @@ require 'rails_helper'
 describe 'Issue Boards', feature: true, js: true do
   include DragTo
 
-  let(:project) { create(:empty_project, :public) }
+  let(:group) { create(:group, :nested) }
+  let(:project) { create(:empty_project, :public, namespace: group) }
   let(:board)   { create(:board, project: project) }
   let(:user)    { create(:user) }
   let!(:user2)  { create(:user) }