bisect-kit: Tolerate build info without board-metadata

BUG=b:233314195
TEST=run version_info('brya', 'R103-14799.0.0')

Change-Id: If0ab151e9dbfd5d8629f25b6bd36430ffb21425c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bisect-kit/+/3655426
Auto-Submit: Zheng-Jie Chang <zjchang@chromium.org>
Tested-by: Zheng-Jie Chang <zjchang@chromium.org>
Reviewed-by: Tai-Hsu Lin <sheckylin@chromium.org>
Commit-Queue: Tai-Hsu Lin <sheckylin@chromium.org>
Tested-by: Tai-Hsu Lin <sheckylin@chromium.org>
1 file changed