listen freezes if gstreamer plugins are missing

Binary package hint: listen

When you try to play a mp3 file with listen, listen will freeze immediately.The freeze is caused by the restricted gstreamer mp3 decoders missing on my system.

Correct behaviour:
If you use rhythmbox and try to play a mp3 a dialog appears and asks to install the missing gstreamer decoders. At least an error message should be expected.

Release: 9.10

# apt-cache policy listen
listen:
  Installed: 0.6.2-1ubuntu3
  Candidate: 0.6.2-1ubuntu3
  Version table:
 *** 0.6.2-1ubuntu3 0
        500 http://de.archive.ubuntu.com karmic/universe Packages
        100 /var/lib/dpkg/status