Luke 2ad25aa8f8 LibWeb: Return null in Window.{top,parent} if browsing context is null ...

We were asserting that it exists, but the spec says to return null in
this case.

Top: https://html.spec.whatwg.org/multipage/browsers.html#dom-top
Parent: https://html.spec.whatwg.org/multipage/browsers.html#dom-parent

2021-05-31 14:22:38 +04:30

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