Use Core dropdown list when license doesn't support assignees list

ee/app/views/shared/issuable/_board_create_list_dropdown.html.haml

-.dropdown.prepend-left-10#js-add-list
-  %button.btn.btn-create.btn-inverted.d-flex.js-new-board-list{ type: "button", data: board_list_data }
-    %span Add list
-    = sprite_icon('chevron-down', size: 16, css_class: 'prepend-left-5 btn-new-board-list-chevron')
-  .dropdown-menu.dropdown-menu-paging.dropdown-menu-right.dropdown-menu-issues-board-new.dropdown-menu-selectable.dropdown-menu-tabs
-    %ul.nav.nav-tabs.dropdown-tabs-list.js-new-board-list-tabs{ role: 'tablist' }
-      %li.nav-item.dropdown-tab-item.js-tab-button-labels
-        %a.active{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-labels', target: '#tab-labels' } }
-          Label list
-      %li.nav-item.dropdown-tab-item.js-tab-button-labels
-        %a{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-assignees', target: '#tab-assignees' } }
-          Assignee list
-    .tab-content
-      #tab-labels.tab-pane.tab-pane-labels.active.js-tab-container-labels{ role: 'tabpanel' }
-        = render partial: "shared/issuable/label_page_default", locals: { show_title: false, show_footer: true, show_create: true, show_boards_content: true, content_title: _('Label lists show all issues with the selected label.') }
-        - if can?(current_user, :admin_label, board.parent)
-          = render partial: "shared/issuable/label_page_create", locals: { show_close: false }
-      #tab-assignees.tab-pane.tab-pane-assignees.js-tab-container-assignees{ role: 'tabpanel' }
-        = render partial: "shared/issuable/assignee_page_default"
-    = dropdown_loading
+- if board.parent.feature_available?(:board_assignee_lists)
+  .dropdown.prepend-left-10#js-add-list
+    %button.btn.btn-create.btn-inverted.d-flex.js-new-board-list{ type: "button", data: board_list_data }
+      %span Add list
+      = sprite_icon('chevron-down', size: 16, css_class: 'prepend-left-5 btn-new-board-list-chevron')
+    .dropdown-menu.dropdown-menu-paging.dropdown-menu-right.dropdown-menu-issues-board-new.dropdown-menu-selectable.dropdown-menu-tabs
+      %ul.nav.nav-tabs.dropdown-tabs-list.js-new-board-list-tabs{ role: 'tablist' }
+        %li.nav-item.dropdown-tab-item.js-tab-button-labels
+          %a.active{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-labels', target: '#tab-labels' } }
+            Label list
+        %li.nav-item.dropdown-tab-item.js-tab-button-assignees
+          %a{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-assignees', target: '#tab-assignees' } }
+            Assignee list
+      .tab-content
+        #tab-labels.tab-pane.tab-pane-labels.active.js-tab-container-labels{ role: 'tabpanel' }
+          = render partial: "shared/issuable/label_page_default", locals: { show_title: false, show_footer: true, show_create: true, show_boards_content: true, content_title: _('Label lists show all issues with the selected label.') }
+          - if can?(current_user, :admin_label, board.parent)
+            = render partial: "shared/issuable/label_page_create", locals: { show_close: false }
+        #tab-assignees.tab-pane.tab-pane-assignees.js-tab-container-assignees{ role: 'tabpanel' }
+          = render partial: "shared/issuable/assignee_page_default"
+      = dropdown_loading
+- else
+  = render_ce 'shared/issuable/board_create_list_dropdown', board: board