Reproduce: Click "send_reminder_preview" button on purchase form and error raise. Missing check if actions are None or not before get its length. closes odoo/odoo#102563 X-original-commit: 0ba99bd71d47571ac748ab0ecd68c52891cddb9f Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com> Signed-off-by: Yuchen Huang (yhu) <yhu@odoo.com>