[Patch + RFC][contrib] gcc-changelog/git_commit.py: Check for missing description

[Tobias Burnus]

In terms of issues, it seems as if Ubuntu 20.04.1 LTS has a too
old unidiff – I copied the check from test_email.py and applied
it to git_email.py – otherwise, nearly all tests fail.

Still, I do see some fails – I have attached the fails I got.
(fails.log, second attachment)

Independent of that, I have now written a check for an empty
description.

OK for the patch and thoughts about the fails?

Tobias

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