When there is not enough recipients for the A/B testing percentage, we pick a minimum of one recipients (if there is at least one) to avoid sending a/b test to no one. task-2713198 closes odoo/odoo#107488 X-original-commit: e1fa7b10250efc790452f02490ab84d2183698ff Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>