Handle close code if it was not handled before closing

[west0r]

WebSocket not handle close code when connection was closed by server. I handle code on closing.

[snoozemoose]

@west0r I'm experiencing occasional crashes in handleCloseCodeFromFirstCloseFrameIfNeeded() on the line if frame.code == .close {, is this anything you have seen?

[west0r]

@snoozemoose no, my problem was related to ability to handle close code. I didn't see any crashes.

[beefon]

I'd love this to be merged, so far no crashes for me, but I'd like to switch from locally changed version to the upstream.