Log Message:
Update to 1.4.9.1:

VERSION 1.4.9
  BUGFIXES:
    * The last.fm dialog did not always properly disable options when the
      username was not entered.
    * Fix Amazon Cover fetching by using their new web service api.
    * Don't insert items into Dynamic Mode that don't exist.
    * If unavailable tracks are in the Playlist and random mode is on, don't
      stop those tracks if selected; continue with available tracks.