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

Resolves #4345 (closed).

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Migrated from D8030 (view on Phabricator)

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Patch application report for D8030 (id=28918)

Rebasing onto 6da99426...

Current branch diff-target is up to date.

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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/240/ for more details.

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