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

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

--- Comment #7 from Olli Pettay <bugs@pettay.fi> ---
I don't feel strongly about this.
But I think returning always an array makes the API more consistent.
addedNodes and removedNodes tell always which nodes where added or removed,
and in cases of non-childList they are empty, since nothing was added or
removed.

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