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

Automatically eliding empty dictionaries might make it harder to provide invariants to JS, like:
```js
if (pc.getParameters().rtcp.cname) // TypeError: pc.getParameters(...).rtcp is undefined
```
That might be correct in this particular case, but as a general rule, I could see it causing edges if a returned dictionary is mostly not empty.

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