ErrorException: Warning: Invalid argument supplied for foreach()

Sentry Issue: [NDNCOLLECTIVE-ORG-D](https://sentry.io/organizations/tiny-pixel-collective/issues/1442432166/?referrer=github_integration)

```
ErrorException: Warning: Invalid argument supplied for foreach()
File "/web/app/plugins/wp-rocket/inc/classes/Cache/class-expired-cache-purge.php", line 120, in WP_Rocket\Cache\Expired_Cache_Purge::purge_expired_files
foreach ( $files as $item ) {
File "/web/app/plugins/wp-rocket/inc/classes/subscriber/Cache/class-expired-cache-purge-subscriber.php", line 197, in WP_Rocket\Subscriber\Cache\Expired_Cache_Purge_Subscriber::purge_expired_files
$this->purge->purge_expired_files( $this->get_cache_lifespan() );
File "/web/wp/wp-includes/class-wp-hook.php", line 287, in WP_Hook::apply_filters
$value = call_user_func_array( $the_['function'], $args );
File "/web/wp/wp-includes/class-wp-hook.php", line 311, in WP_Hook::do_action
$this->apply_filters( '', $args );
File "/web/wp/wp-includes/plugin.php", line 544, in do_action_ref_array
$wp_filter[ $tag ]->do_action( $args );
...
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```