PHPOffice / PHPWord / 34202479413

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Reader Word2007: prevent null being passed to htmlspecialchars() for headings without text (#2932)

* Add failing test for null passed to htmlspecialchars() when reading a heading

A heading whose single run has no w:t makes XMLReader::getValue() return
null, which AbstractPart hands straight to htmlspecialchars(). On PHP 8.1+
that is a deprecation.

* Fix: prevent null being passed to htmlspecialchars() in AbstractPart.php

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Co-authored-by: Dafydd <maund.dafyddrhys@gmail.com>

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