- don't create duplicate log messages

- note when the data part of the tech/data pair is missing not only when using
  the app version, but the exten version as well
- instead of logging syntax errors, just output them to the CLI


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@23284 65c4cc65-6c06-0410-ace0-fbb531ad65f3