webkit/parser.py throws a cryptic error when you forget to give a name to a function argument in messages.in files. Fix that.
<rdar://problem/103410108>
Pull request: https://github.com/WebKit/WebKit/pull/7706
Committed 257969@main (f26048aa0095): <https://commits.webkit.org/257969@main> Reviewed commits have been landed. Closing PR #7706 and removing active labels.