[Bug 19463] MutationRecord added/removedNodes could return empty array, not null

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19463

--- Comment #8 from Olli Pettay <bugs@pettay.fi> ---
Somewhat similar happens for example with
document.querySelectorAll("foo").
If there are no foos, it is empty list, not null which is returned.

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