'Stream audio support for Canvas' bricks IE11

It's a good feature, but if you don't use any Sound in your file, it's still referenced in the JS, and uses Map.prototype.keys() method, which isn’t supported in IE11.

It feels logical that if you don't use this new feature it does not get exported into the Javascript file.

I know IE support is not officially supported by Adobe Animate, but still feels like this could be handled better.