Linus Groh 766f30f593 LibJS: Check if class extends value has a valid prototype ...

If we have a function as class extends value, we still cannot assume
that it has a prototype property and that property has a function or
null as its value - blindly calling to_object() on it may fail.

Fixes #5075.

2021-01-24 00:09:18 +01:00

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