Fix release script bugs after experience from 0.2.0:

- The NEWS step failed due to an empty commit comment.
- The final release step would have failed, because the steps to switch
  from the secure to insecure repository (and back again) require both
  switch and a URL relocation steps


git-svn-id: svn://svn.berlios.de/openocd/trunk@2782 b42882b7-edfa-0310-969c-e2dbd0fdcd60