InvalidArgumentException while trying to render item

Problem/Motivation

When indexing the rendered output of pages for something like solr using drush, I'm getting this notice:

[error] InvalidArgumentException while trying to render item entity:node/XXX:en with view mode default for search index Content: Route required in Drupal\Core\Url::fromRouteMatch() (line 168 of /code/web/core/lib/Drupal/Core/Url.php).

That's because the help block in webform_help wants to check to see if you're on a webform page, but I guess if you're indexing through drush there is no route provided...

Steps to reproduce

1. Enable "webform"
2. Enable the "help" module
3. Set up the site to index a rendered version of your content using search_api
4. Run "drush sapi-i"
5. See the Notices.

Proposed resolution

It's the same solution as https://www.drupal.org/project/webform/issues/3158332 -- just add a check to bail out if there's no route provided. I'll get a patch or merge request up shortly.

Remaining tasks

Submit a patch

User interface changes

- None -

API changes

- None -

Data model changes

- None -