Uniform lead, contract w/o phone_number
CHANGELOG:
### FIXED
- [#719](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/719) Unificació criteri contractes sense fix
Related card: https://trello.com/c/4seghrn4/1117-unificaci%C3%B3-criteri-contractes-sense-fix
Edited by Pelayo García