CallerID: Fix parsing regression

This fixes a regression in callerid parsing introduced when another bug
was fixed. This bug occurred when the name was composed entirely of
DTMF keys and quoted without a number section (<>). 

ASTERISK-24406 #close
Reported by: Etienne Lessard
Tested by: Etienne Lessard
Patches:
    callerid_fix.diff uploaded by Kinsey Moore
Review: https://reviewboard.asterisk.org/r/4067/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@425152 f38db490-d61c-443f-a65b-d21fe96a405b