Re: [heycam/webidl] Sort out when dictionaries and records should have default values (#76)

Explicit `null` is the only reliable way to get an empty dictionary, as I said above.  Furthermore, it's not treated as "missing" for _any_ data type in webidl.  So while there is a case to be made for treating explicit/implicit (should behave the same) `undefined` as missing, explicit `null` should in fact be treated as empty dictionary, period.

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