[heycam/webidl] Handle conversion failures in 'upon settling'. (#791)

Fixes #782.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/791

-- Commit Summary --

  * Handle conversion failures in 'upon settling'.

-- File Changes --

    M index.bs (11)

-- Patch Links --

https://github.com/heycam/webidl/pull/791.patch
https://github.com/heycam/webidl/pull/791.diff

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