Add test for DirectoryBuilder on missing directories

Just to make sure they don't crash like contents currently do (#4345 (closed))

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Migrated from D8031 (view on Phabricator)

Build is green

Patch application report for D8031 (id=28919)

Could not rebase; Attempt merge onto 6da99426...

Updating 6da9942..c07d934
Fast-forward
 swh/vault/tests/test_to_disk.py | 60 +++++++++++++++++++++++++++++++++++++----
 swh/vault/to_disk.py            | 17 ++++++++----
 2 files changed, 67 insertions(+), 10 deletions(-)

Changes applied before test

commit c07d934aeff664c2e4b74818133344576d99b23f
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Thu Jun 23 10:18:59 2022 +0200

    Add test for DirectoryBuilder on missing directories

commit 141b4531b1a6924806787252db15172422553c04
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Thu Jun 23 10:04:16 2022 +0200

    Fix crash on directories pointing to missing contents
    
    This can happen for various reasons, such as running the vault on
    a mirror that is partially replayed

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/241/ for more details.

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