[OTS] Allow empty Private DICT inside CFF data

BUG=chromium:112414
TEST=ran test_{un,}malicious_fonts.sh
Review URL: https://chromiumcodereview.appspot.com/9447013

git-svn-id: http://ots.googlecode.com/svn/trunk@81 a4e77c2c-9104-11de-800e-5b313e0d2bf3
1 file changed