Issue #3417994: Do not set properties that do not exist in RestResponseDescribe

Closes #3417994

src/Rest/RestResponseDescribe.php

@@ -148,9 +148,10 @@ class RestResponseDescribe extends RestResponse {
     }
 
     foreach ($response->data as $key => $value) {
-      if ($key == 'fields') {
+      if ($key == 'fields' || !property_exists($this, $key)) {
         continue;
       }
+
       $this->$key = $value;
     }
     $this->data = $response->data;