Make empty searches skip authority recommendations (#1433)

module/VuFind/src/VuFind/Recommend/AuthorityRecommend.php

@@ -281,6 +281,11 @@ class AuthorityRecommend implements RecommendInterface
     {
         $this->results = $results;
 
+        // empty searches such as New Items will return blank
+        if ($this->lookfor == NULL) {
+            return;
+        }
+
         // function will return blank on Advanced Search
         if ($results->getParams()->getSearchType() == 'advanced') {
             return;