tree bdc785bb5548c8a92cbcab2fb6125ba95faa0b21
parent ae58f93a0009c00160a678f7885d827ca9115c30
author sbc@chromium.org <sbc@chromium.org> 1421270292 +0000
committer sbc@chromium.org <sbc@chromium.org> 1421270292 +0000

Add checks to GitSanityChecks (upstream branch or current branch can be None)

I've run in the exceptions a few times when doing
'git cl presubmit' or 'git cl lint' from a detached
HEAD state (not uncommon when using 'git rebase-update')

Review URL: https://codereview.chromium.org/792933003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@293643 0039d316-1c4b-4281-b951-d872f2087c98