[FW][FIX] digest: do not write on default digest if not necessary #162434
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When a portal user is created (e.g. through the
auth_signup
module),an unnecessary write is done on the
write_date
of the default digest.This
write
is unnecessary since a portal user is never subscribed tothe default digest.
In case of a high signup frequency, it can cause concurrent transaction
errors.
We avoid writing if no internal user is being created.
Forward-Port-Of: #162230