As per GitHub pages deployment fails with "missing github_token", this is a bug in build config validation.
@BanzaiMan Where’s the source code for build config validation? I don’t see anything relevant in https://github.com/travis-ci/travis-web. There are relevant-looking functions in https://github.com/travis-ci/travis-web/blob/master/app/components/build-message.js but they aren’t used by anything.