Packaging debian-obly package (no upstream)

[Tomasz Buchert <tomasz.buchert@inria.fr>]

Hello mentors,
I am working on one bug of mine
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=664457) and I've
noticed that, technically, my new package will have no upstream. What is
the packaging workflow in this case? All tutorials/manuals I've read
assume that you work with upstream tarball and a lot of debian tools
assume that *orig.tar.gz is present.
Do you know what is a proper way to do that? I'm using git for most of
the packaging activities if it matters.

Cheers,
Tomasz