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fix(backport): Test xml.etree.ElementTree.Element truth value by 'is …
…not None' (scikit-hep#2499) * Backport PR scikit-hep#2459 * In Python 3.14 testing the truth value of an xml.etree.ElementTree.Element is deprecated and will raise an exception. As of Python 3.12 this behavior will raise a DeprecationWarning: ``` DeprecationWarning: Testing an element's truth value will raise an exception in future versions. Use specific 'len(elem)' or 'elem is not None' test instead. ``` To avoid this, determine the truth element by using the 'elem is not None' method. - c.f. https://docs.python.org/3.12/library/xml.etree.elementtree.html#element-objects Co-authored-by: Matthew Feickert <matthew.feickert@cern.ch>
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