Re: [webcomponents] deepPath's definition is ambiguous when the event path contains a non-Node EventTarget (#432)

In particular, what happens if the path included a `Node` but the current target wasn't a `Node`?  If such a situation can arise, then we can't determine whether a `Node` should be unclosed or not.

If such a situation can arise, I think returning an empty array when the current target is not a `Node` makes most sense.  In fact, most of non-Node targets don't have anything to bubble up (e.g. XHR; is there any?) so there might not be any use case for `deepPath()` anyway.


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