Issue #3513835 by bluegeek9: PHP Deprecated: preg_quote(): Passing null to...

Steven Ayersrequested to merge
issue/page_manager-3513835:3513835-php-deprecated- into 8.x-4.x

Issue #3513835 by bluegeek9: PHP Deprecated: preg_quote(): Passing null to parameter of type string is deprecated

Closes #3513835

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