[w3c/ServiceWorker] Update handle fetch algorithm step to consider null of source (PR #1768)

This PR fixes the handle fetch algorithm to check the nullness of Get Router Source (`source`)


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1768

-- Commit Summary --

  * Update handle fetch algorithm step to consider null of source

-- File Changes --

    M docs/index.bs (89)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1768.patch
https://github.com/w3c/ServiceWorker/pull/1768.diff

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