Check whether the view entity is new before trying to generate an url

Closes #3447012

src/Plugin/views/display/DataExport.php

@@ -560,7 +560,9 @@ class DataExport extends RestExport {
     }
 
     if ($plugin = $clone->display_handler->getPlugin('style')) {
-      $plugin->attachTo($build, $display_id, $clone->getUrl(), $title);
+      if (!$clone->storage->isNew()) {
+        $plugin->attachTo($build, $display_id, $clone->getUrl(), $title);
+      }
       foreach ($clone->feedIcons as $feed_icon) {
         $this->view->feedIcons[] = $feed_icon;
       }