This patch allows null args in ast_expr2 func calls, and fixes commas being...

This patch allows null args in ast_expr2 func calls, and fixes commas being converted to pipes, which was 1.4 type stuff.

If the user says count=ENUMLOOKUP(${EXTEN},ALL,c,,enum.mydomain.tld);

then it won't complain about the empty arg (c,,...) and fabled's patch
won't let it swap the commas for pipes.

Ran it thru my dialplan and no complaints.


(closes issue #14169)
Reported by: fabled
Patches:
      function-argument-separator-fix.diff uploaded by fabled (license 448)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@168737 65c4cc65-6c06-0410-ace0-fbb531ad65f3