Re: [w3c/ServiceWorker] Navigation preload shouldn't occur when there is no fetch event handler (#1058)

Good catch. The preload fetch shouldn't be sent if there's no fetch listener.

I don't think `enable()` should reject in this case, as preloading is a property of the registration, but "having a fetch listener" is a property of the service worker. Eg, I could successfully `enable()`, then update to a service worker without a fetch handler.



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