[MERGE] Hide the transport direction in the progress bar if it is unknown.

[Ian Clatworthy]

Ian Clatworthy has voted approve.
Status is now: Approved
Comment:
  probably prefer X to ' ' but either is an improvement.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C49DB5A6E.6090209%40vernstok.nl%3E
Project: Bazaar