Fix the corner case when bisect points to the skipped commit

In this case we can proceed, while "git bisect run" returns
non-zero error code.

Bug: chromium:817515
Change-Id: Icfd9d52c3116c760d8368d148d4b123efb028a32
1 file changed
tree: ff9e976db96c2c4b801a67ceb33113a7106e126e
  1. gae/
  2. gce/
  3. .gitignore
  4. codereview.settings
  5. OWNERS
  6. WATCHLISTS