[FIX] crm: specify at least one field in search views
[FIX] crm: specify at least one field in search views

Without at least one field, performing a search in these models' search
view is outright impossible.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo