some more protection from passing around and printing null values, we are now initializing null's passed to switch_caller_profile_new as blank strings in the caller profile, if your using any caller profile values in if's, please use !switch_strlen_zero() in your check.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4203 d0543943-73ff-0310-b7d9-9358b9ac24b2