I really sorry Raphael. All my fault. I introduced this bug and I'm also responsible for the huge delay to upload a new package. Unfortunately, I had been more than busy over the past months. While I fixed it seem, I always wanted to investigate other issues on the mailing list before uploading a new package. But now it turned out those issues on the mailing list either had been this bug here, or incorrect arguments/usage.
I just uploaded a new package to mentors. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org