Issue #3403954 by yobottehg: Adapt to the new empty results empty facet behaviour of facets

modules/jsonapi_search_api_facets/src/EventSubscriber/AddSearchMetaEventSubscriber.php

@@ -79,7 +79,7 @@ class AddSearchMetaEventSubscriber implements EventSubscriberInterface {
 
         // If there are no results, the facet manager adds empty behavior render
         // array data. We need to strip that out.
-        if (count($facet->getResults()) === 0) {
+        if (is_array($facet_data) && count($facet->getResults()) === 0) {
           $facet_data = reset($facet_data);
         }