[w3c/ServiceWorker] Steps for Update have an empty condition for async modules (Issue #1732)

Update step 8 says:

> If script is null or [Is Async Module](https://w3c.github.io/ServiceWorker/#is-async-module) with script’s [record](https://html.spec.whatwg.org/multipage/webappapis.html#concept-script-record), script’s [base URL](https://html.spec.whatwg.org/multipage/webappapis.html#concept-script-base-url), and « » is true, then:

https://w3c.github.io/ServiceWorker/#update

I'm assuming that there is a missing check there where that placeholder is supposed to be. 

I'm not sure what the check is supposed to be though. This condition was added in https://github.com/w3c/ServiceWorker/pull/1444

<https://github.com/w3c/ServiceWorker/commit/9c77873f4843d06506049ddc57b6ac4508953922#diff-7bdebf23eab87aaf2676a41586076394031b6b98fde24e35d1672aa65a1cc0feR2716>

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