In some cases, GitHub will return strings in it's json errors list. Our error parser should handle this case.
<rdar://problem/104142306>
Pull request: https://github.com/WebKit/WebKit/pull/8545
Committed 258832@main (d162593c2f1e): <https://commits.webkit.org/258832@main> Reviewed commits have been landed. Closing PR #8545 and removing active labels.