This commit modifies `execute` method to avoid `MissingError` on reading `template_ref` field. `template_ref` is a Reference field, which may have id of a deleted record. https://github.com/odoo/odoo/blob/927890d0178c361ef8d80fe6a1ec2ffaefaf73fd/addons/event/models/event_mail.py#L53 Method `execute` is used by cron. https://github.com/odoo/odoo/blob/fba13477843d4d36e3e7a9ddd4b0812c9726e20c/addons/event/data/ir_cron_data.xml#L4-L8 https://github.com/odoo/odoo/blob/927890d0178c361ef8d80fe6a1ec2ffaefaf73fd/addons/event/models/event_mail.py#L247-L256 Getting the `MissingError` means blocking processing the whole batch of tickets. Fix it by ignoring such tickets and logging a warning https://online.sentry.io/issues/4089773378 closes odoo/odoo#121199 X-original-commit: c61a8fbb7d4338ca362a3d2093e7aa2f973b289c Signed-off-by: Ivan Elizaryev (iel) <iel@odoo.com>