Sam Atkins ba6d37ee6f LibWeb: Propagate errors when parsing StyleValues ...

This necessitated returning `nullptr` instead of just `{}` in a lot of
places. Also, some temporary hackiness in `parse_css_value()`: That
returns a special `ParseError` type already, so we now have a
`FIXME_TRY()` macro which logs the error and then returns a generic
`ParseError::InternalError` value. Eventually this macro will go away,
once I figure out how to deal with this more nicely.

2023-05-06 08:07:28 +02:00

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