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

Context: https://github.com/WebAudio/web-audio-api/issues/980

Let's simplify:

```WebIDL
dictionary Foo {
  EventTarget target;
};
```

The only difference to making it nullable is that `{target: null}` would throw TypeError, might one want that?

Or: should WebIDL require (hah) that required dictionary members are non-nullable and that optional ones are nullable? And have a default value of null, so that omitting can't have another meaning?

(Sorry if the spec already has some requirements like this, it's big.)

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