test_server: Simplify exception manipulations

Test Plan

tox

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Migrated from D4286 (view on Phabricator)

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commit 4fcd407139502035759bee9268cc5499375de356
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Fri Oct 16 13:35:54 2020 +0200

    test_server: Simplify exception manipulations

See https://jenkins.softwareheritage.org/job/DSCH/job/tests-on-diff/65/ for more details.

Clarify some docstrings

Build is green

Patch application report for D4286 (id=15150)

Rebasing onto 315a2c9d...

Current branch diff-target is up to date.

Changes applied before test

commit dd33cdcfd266f80cb94eb9b3a32fc2c3f2f63592
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Fri Oct 16 13:35:54 2020 +0200

    test_server: Simplify exception manipulations

See https://jenkins.softwareheritage.org/job/DSCH/job/tests-on-diff/67/ for more details.

Merge request was merged

closed

mentioned in merge request !293 (closed)