🐛 Bug Report — WebSocket constructor throws SyntaxError error when protocols array is empty

[volkanunsal]

https://github.com/cloudflare/workerd/blame/39fb8495e5a4a700ccfdf2ec5e201fd590be046e/src/workerd/api/web-socket.c%2B%2B#L228

This is causing problems for us using WebSocket API. The web standard doesn't throw a SyntaxError when protocols array is empty, and I've been relying on this functionality in a project, which currently cannot be deployed to Cloudflare platform because we're getting this error:

✘ [ERROR] XXX: Error creating WebSocket instance: DOMException {

    code: 12,
    name: 'SyntaxError',
    message: 'WebSocket Constructor: The protocols array cannot be empty.',
    stack: 'SyntaxError: WebSocket Constructor: The protocols array cannot be empty.\n' +
      '    at null.<anonymous>
  }

Please advise.

[anonrig]

Before addressing this, I've opened a PR to improve the test coverage on websockets.