[racket] Checksum not found for git tags packages

Hi,

I can't manage to have pkg.racket-lang.org to get the checksum of my git
tags, for example:
github://github.com/Metaxal/MrEd-Designer/v3.12/
which seems to be in line with the docs:
http://docs.racket-lang.org/pkg/Package_Concepts.html#%28tech._package._source%29

The tags are annotated, and created with
git tag -a <..> -m <...>
so they should contain a checksum.

Am I doing something wrong?

Laurent
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