bisect-kit: fix exception when not recompute initial values

BUG=None
TEST=unittest

Change-Id: I5028817f70baa4b5d58a0ffe440bd78547b7f24e
Reviewed-on: https://chromium-review.googlesource.com/1621579
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Chi-Ngai Wan <cnwan@google.com>
Reviewed-by: Chung-yih Wang <cywang@google.com>
2 files changed