Andreas Kling c60dc84a33 LibJS: Allow function calls with missing arguments ...

We were interpreting "undefined" as a variable lookup failure in some
cases and throwing a ReferenceError exception instead of treating it
as the valid value "undefined".

This patch wraps the result of variable lookup in Optional<>, which
allows us to only throw ReferenceError when lookup actually fails.

2020-03-27 12:56:05 +01:00

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