Raise error if parent pack contract does not exist
CHANGELOG:
### Changed
- [#919](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/919) Raise error if parent pack contract does not exist
Related card: https://trello.com/c/HROTOzwA/1448-controlar-la-creaci%C3%B3-dels-contractes-de-pack
Edited by Gerard Funosas