bisect-kit: buildbucket_util: ignore builds without artifacts

BUG=b:201256582
TEST=manually

Change-Id: I913ef757049d593587020442d4fe75d7c56f7593
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bisect-kit/+/3193989
Tested-by: Zheng-Jie Chang <zjchang@chromium.org>
Auto-Submit: Zheng-Jie Chang <zjchang@chromium.org>
Reviewed-by: Kuang-che Wu <kcwu@chromium.org>
Commit-Queue: Kuang-che Wu <kcwu@chromium.org>
1 file changed