[w3c/ServiceWorker] clients.get() should resolve with null instead of undefined (#1133)

This was confusing using the API since getElementById (and other similar apis) return null, while this seems to resolve to undefined instead.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/ServiceWorker/issues/1133