Bug 18050: (QA follow-up) Adjust conditions and make use of message text

Bug 18050: (QA follow-up) Adjust conditions and make use of message text

- When we run into invalid data, we use Augustin's suggested solution
  and copy the data into a separate table, setting the budget_period_id to
  NULL.
- We amend the output using the new $message.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 3c8bef50a223e70fe3023222f5f940a2b1771b5d)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>