deprecated warning fix

web/modules/custom/materio_sapi/src/Controller/Base.php

@@ -338,11 +338,11 @@ class Base extends ControllerBase {
     // $this->terms = $request->query->get('terms');
     $t = $request->query->get('terms');
     // $this->terms = strlen($t) ? explode(',', $t) : null;
-    $this->terms = strlen($t) ? json_decode($t) : null;
+    $this->terms = $t && strlen($t) ? json_decode($t) : null;
 
     // get the filters of advanced search
     $f = $request->query->get('filters');
-    $this->filters = strlen($f) ? explode(',', $f) : null;
+    $this->filters = $f && strlen($f) ? explode(',', $f) : null;
     // $this->allparams = $request->query->all();
     // $request->attributes->get('_raw_variables')->get('filters')
     //