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Issue #3271517: Passing null to htmlspecialchars is deprecated

Bill Seremetis requested to merge issue/drupal-3271517:3271517-9.4.x-htmlspecialchars into 9.4.x

Updating to PHP 8.1 brings this error:

Deprecated function: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\Component\Utility\Html::escape() (line 424 of core/lib/Drupal/Component/Utility/Html.php).

MR fixes it.

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