Demo forum posts in the Helpdesk Forum area are now assigned to the intended user instead of Odoobot. This keeps demo karma ownership accurate and avoids confusing sample data when teams review or demonstrate the feature.

Purpose
=======
Now that we show the owner of the Karma tracking, we want to fix the
demo data, so they do not belong to Odoobot.

Task-2234179

This fixes a minor issue in the Knowledge app's data setup process that could fail when article member information is missing. The change helps keep setup and test data generation reliable without changing normal user workflows.

We here fix the issue of possibly iterating over a `False` value (`get` fallback) for `article_member_ids` (from c1c275cf) by avoiding the loop altogether in this case, in favor of readability and efficiency.

Task-3215864