Allow non-string values for 'start_date' change tariff as API parameter
CHANGELOG:
### Fixed
- [#771](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/771) Allow non-string values for 'start_date' as change tariff API parameter
Related card: https://trello.com/c/IdvbmDdf/1205-urgent-acceptar-data-de-canvi-de-tarifa-format-otrs
OTRS sends a '{}' value when date-formatted DF are empty, instead of an empty string
{
"code": "56757",
"product_code": "SE_SC_REC_BA_F_100_SF",
"start_date": {}
}
Edited by Pelayo García