AudioWorkletNodeOptions.processorOptions should not default to null.

[hoch]

Describe the issue
Because it is defaulting to null, the processor always get null for the field even the main scope option object is undefined. We should make it a plain object.

object processorOptions;

Where Is It
https://webaudio.github.io/web-audio-api/#dictdef-audioworkletnodeoptions

[hoch]

The setup code:

const node = new AudioWorkletNode(context, 'processor', nodeOptions);

class extends AudioWorkletProcessor {
  constructor(options){
    console.log(options);
  }
}

When nodeOptions = {}:

{numberOfInputs: 1, numberOfOutputs:1}

When nodeOptions = {foo: 'bar'}:

{numberOfInputs: 1, numberOfOutputs:1}

When nodeOptions = {foo:bar, processorOptions: {foo:'bar'}}:

{numberOfInputs: 1, numberOfOutputs:1, processorOptions: {foo:'bar'}}

[hoch]

From WG Telecon:
Remove the nullable type and the default value from processorOptions.

[karlt]

I'm not aware of any benefit in processorOptions being nullable.

If the value could default to the empty object, then that would permit clients to test for members without throwing a TypeError when processorOptions is not specified, but I don't think it is possible to specify an empty object default in WebIDL.

So, yes, the proposed change seems the best option available.