"Vault Status" page doesn't get updated when asking for email notifications

When downloading a directory on the web-app the item doesn't appear in the vault admin page (same session and all)

This happens when you set an email address for the completion notification.

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(this was a report for a transient issue with the vault, which got fixed)

Also in the notification email, I got:

You have requested the following bundle from the Software Heritage
Vault:

Object Type: directory
Object ID: 00b4bcdff80e8b3c180e481c76709fc876958b8a

This bundle could not be cooked for the following reason:

Internal Server Error. This incident will be reported.

We apologize for the inconvenience.

-- 
The Software Heritage Developers

1. check if swh-team or devs received the report (not from me on IRC)
2. check the error of the non cooked bundle
3. check if the hiccup on the web-app was a one time thing

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Migrated from T2283 (view on Phabricator)