TEST_FRAMEWORK: Fix threewaytransfer reporting

Ensure that three-way transfers can be reported even if featuremap is
non-NULL.
........

Merged revisions 418810 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418811 65c4cc65-6c06-0410-ace0-fbb531ad65f3