Date range facet values don't appear in Facets Summary

#6 does the following

When results are empty (they can be with a date range facet), this throws a fatal error. This should be preceded by a check to make sure $results is not empty.

Rather than get the url parameters from the facet which can return no results, I changed the logic to use the current request. This allows us to show facet summary regardless if there are no results or not.

I changed the logic on string replace to match the new format.

  $pattern = '/min:\d+/';
                  $replacement = 'min:';
                  $clear_set_min_date = preg_replace($pattern, $replacement, $filter);

Added a label to the facet summary "pills"

 $min_label = $facet_instance->getWidget()['config']['min_label'];
                  $value = Markup::create('<strong>' . $this->t($min_label) . '</strong>: ' . gmdate($this->getConfiguration()['date_format'], $min));
                  $item = [
                    '#theme' => 'facets_result_item__summary',
                    '#value' => $value,