For some properties (gradient, drop-shadow) we can't resolve currentcolor early enough. We should return an invalid color in those cases instead of crashing.
rdar://108683501
Pull request: https://github.com/WebKit/WebKit/pull/14287
Committed 264737@main (80e4d733b917): <https://commits.webkit.org/264737@main> Reviewed commits have been landed. Closing PR #14287 and removing active labels.