message: SessionManager.findTorrent outputs a log warning when it finds the torrent handle but it is invalid
diff: @@ -446,6 +446,9 @@ public class SessionManager {
  }
  torrent_handle th = session.find_torrent(sha1.swig());
  + if (th != null && !th.is_valid()) {
  + LOG.warn("SessionManager.find(Sha1Hash " + sha1.toHex() + ") found, but it is invalid");
  + }
  return th != null && th.is_valid() ? new TorrentHandle(th) : null;
  }
  