Previously, solution's properties would be ignored if there was no DEPS file in
source control. Change the behavior to evaluate the properties anyway.

TEST=new smoke test
BUG=none

Review URL: http://codereview.chromium.org/4154004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@64232 0039d316-1c4b-4281-b951-d872f2087c98