PHP 8.4 - null revision log message causes TypeError in Html::escape() during bulk publish

Problem/Motivation

Found with PHP 8.4 - when retain_revision_info is enabled, getRevisionLogMessage() can return null, which gets passed as a @message placeholder to t(). Html::escape() now strictly requires string, not null.

TypeError: Drupal\Component\Utility\Html::escape(): Argument #1 ($text) must be of type string, null given, called in /var/www/html/web/core/lib/Drupal/Component/Render/FormattableMarkup.php on line 238 in Drupal\Component\Utility\Html::escape() (line 433 of /var/www/html/web/core/lib/Drupal/Component/Utility/Html.php).

Steps to reproduce

• Run PHP 8.4
• Enable "Retain revision authoring information"
• Create new node as draft with no Revision message
• Bulk publish that node to latest revision

Proposed resolution

$revision_message = (string) ($this->entity->getRevisionLogMessage() ?? ''); // ensures it is always a string

Remaining tasks

1. Patch
2. Review
3. Commit