Shannon Booth d5e41f1f72 LibWeb: Handle null namespace in prefix map serializing XML ...

A "namespace prefix map", see:

https://w3c.github.io/DOM-Parsing/#the-namespace-prefix-map

Is meant to also hold null namespaces:

> where namespaceURI values are the map's unique keys
> (which can include the null value representing no namespace)

Which we previously neglected. This resulted in a crash for
the updated WPT test.

2025-07-07 20:24:47 +01:00

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