The main fix is 'Accept new empty files, like __init__.py'

TBR=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8519005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@109431 0039d316-1c4b-4281-b951-d872f2087c98