Re: [heycam/webidl] Does a non-nullable and non-required dictionary member of interface type make sense? (#176)

I'm not suggesting that null be treated as missing for dictionary members, not even for interface types, but I do wonder if WebIDL can do more to help spec writers figure out when to use the above `dictionary Foo` as opposed to this:

```WebIDL
dictionary Foo {
  EventTarget? target = null;
};
```

I looked in Blink for optional, non-nullable members of interface type, and the only two cases were mistakes:
https://github.com/WebAudio/web-audio-api/issues/980
https://github.com/WebAudio/web-audio-api/issues/985

So, I'm tentatively arguing that for dictionary members of interface type, they must nullable if optional and not nullable if required, and wonder if that's overlooking something.

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