Run of fresh-snapshots for grapefruit

Try this locally (using the package):

debcheckout grapefruit
cd grapefruit
new-upstream --snapshot
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Processing: grapefruit
90% (157/174)   
git: refs/tags/upstream/0.1_a3+dfsg does not point to a valid object!
Total 201 (delta 0), reused 201 (delta 0)
Using upstream branch https://github.com/xav/grapefruit (guessed)
Total 254 (delta 0), reused 0 (delta 0), pack-reused 254
Using version string 0.1~a3+dfsg+git20160817.b3d8837.
No upstream upstream-revision format specified, trying git:b3d8837
No upstream upstream-revision format specified, trying git:b3d8837
Exporting upstream branch revision b'git-v1:b3d88375be727a3a1ec5839fbc462e0e8e0836e4' to create the tarball
Worker failed: Previous upstream version 0.1~a3+dfsg missing (tag: upstream/0.1_a3+dfsg)
Elapsed time: 0:00:08.347577

Full worker log