Fix test broken by swh-storage v1.8.0

mentioned in merge request !453 (merged)

Jenkins job DLDBASE/gitlab-builds #11 failed .
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Fixed by !453 (merged) (which also depends on this MR)

mentioned in merge request !455 (merged)

approved this merge request

added 2 commits

• 274f573b - 1 commit from branch swh/devel:master
• 7c0a0d9f - Fix test broken by swh-storage v1.8.0

Compare with previous version

merged

Jenkins job DLDBASE/gitlab-builds #16 failed .
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