When no results are available, we do not need to sort the facet or render the form item.

Closes #3503793

modules/facets_exposed_filters/src/Plugin/views/filter/FacetsFilter.php

@@ -135,8 +135,8 @@ class FacetsFilter extends FilterPluginBase {
       $query_type_plugin->build();
 
       // When no results are available, we do not need to process the facet or render the form item.
-      if(!$facet->getResults()) {
-        return;
+      if (!$facet->getResults()) {
+        return $form;
       }
 
       // Trigger post query stage.
@@ -151,6 +151,11 @@ class FacetsFilter extends FilterPluginBase {
         $facet->setResults($processor->build($facet, $facet->getResults()));
       }
 
+      // When no results are available, we do not need to sort the facet or render the form item.
+      if (!$facet->getResults()) {
+        return $form;
+      }
+
       // Trigger sort stage and sort the actual results with the sort processors.
       $active_sort_processors = [];
       foreach ($facet->getProcessorsByStage(ProcessorInterface::STAGE_SORT) as $processor) {