LibWeb: Don't crash when upgrading custom element with a bad constructor #3235
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Previously, a crash would occur when attempting to throw an error in this case because the method used to create the exception tried to get the current realm from the execution context stack, which is empty. The realm is now passed explicitly when constructing the error, avoiding the crash.
Fixes: http://wpt.live/custom-elements/parser/parser-fallsback-to-unknown-element.html