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Ensure we pass a string to htmlspecialchars()

Andrew Ruthven requested to merge fix-htmlspecialchars into master

PHP 8.1 deprecated passing null into many functions. This fixes these errors:

Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of
  type string is deprecated in /usr/share/awl/inc/classEditor.php on line 626
Edited by Andrew Ruthven

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