Added missing property declaration.

module/VuFind/src/VuFind/Recommend/SwitchQuery.php

@@ -82,6 +82,13 @@ class SwitchQuery implements RecommendInterface
      */
     protected $transforms = array();
 
+    /**
+     * Search results object.
+     *
+     * @var \VuFind\Search\Base\Results
+     */
+    protected $results;
+
     /**
      * Constructor
      *