[heycam/webidl] A non-optional dictionary argument makes sense at times. (#130)

See https://github.com/w3c/mediacapture-main/issues/366

There are times where omitting a dictionary SHOULD result in a TypeError, even when the dictionary has no mandatory members. In mediacapture's case, the (prose) spec says that TypeError will be thrown from the procedure when you omit all the members.

In this particular case, it doesn't make sense to specify the dictionary as an optional argument, but the current spec forces us to. This is a WebIDL spec "developer gotcha" - not a Good Thing.

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