Fixes depot_tools presubmit

basic.sh expects "work: None", but "work: " is printed instead, which breaks
presubmit.  This fixes it.

BUG=
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/17763004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@208799 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -1054,7 +1054,7 @@ def CMDstatus(parser, args):
       alignment = max(5, max(len(b) for b in branches))
       print 'Branches associated with reviews:'
       for branch in sorted(branches):
-        print "  %*s: %s" % (alignment, branch, branches[branch] or '')
+        print "  %*s: %s" % (alignment, branch, branches[branch])
 
   cl = Changelist()
   if options.field: