Issue #3366199 by sourabhjain, PrabuEla, nitin_lama, prachi6824, keshavv,...

          // Every child item has been cleared out.

          // Now check, if the given route represents an overview page only,

          // without having functionality on its own. In this case, we can safely

          // unset this item, as there aren't any children left.

          // without having functionality on its own. In this case, we can

          // safely unset this item, as there aren't any children left.

          // This assumption is only valid, when the admin_toolbar module is

          // installed because otherwise we won't have child items at all.

          if (admin_toolbar_links_access_filter_is_overview_page($route_name)) {

          }

        }

      }

    } catch (\UnexpectedValueException $e) {

    }

    catch (\UnexpectedValueException $e) {

      // Skip on errors like "base:block has no corresponding route":

      \Drupal::logger('my_module')->error($e->getMessage());

      continue;

            // We can't use #lazy_builder here because

            // ToolbarItem::preRenderToolbarItem will insert #attributes before

            // lazy_builder callback and this will produce Exception.

            // This means that for now we always render Local Tasks item even when

            // the tray is empty.

            // This means that for now we always render Local Tasks item even

            // when the tray is empty.

            '#type' => 'link',

            '#title' => $this->t('Local Tasks'),

            '#url' => Url::fromRoute('<none>'),