[heycam/webidl] Fix error handling around Call(). (#618)

Fixes #207.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/618

-- Commit Summary --

  * Fix error handling around Call().

-- File Changes --

    M index.bs (18)

-- Patch Links --

https://github.com/heycam/webidl/pull/618.patch
https://github.com/heycam/webidl/pull/618.diff

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https://github.com/heycam/webidl/pull/618