gh-118416: Fix possible etree issues when registering default namespaces

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gh-118416: Fix possible etree issues when registering default namespaces #118417

Open danifus opened 3 weeks ago

danifus commented 3 weeks ago

In some circumstances, registering a default namespace prefix ("") with xml.etree.ElementTree.register_namespace could result in serialising incorrect xml

Issue: gh-118416

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