This solves bug 8342, whereby a crash occurs under certain circumstances while...

This solves bug 8342, whereby a crash occurs under certain circumstances while reading a config file with comments-- a call to CB_ADD shouldn't happen if withcomments is zero

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47577 65c4cc65-6c06-0410-ace0-fbb531ad65f3