When testing to send an email of a campaign from the automation marketing app, a traceback is thrown. This is due to a context error. We define a default value which isn't possible to be assigned for the variable. opw-2190077 closes odoo/odoo#47039 X-original-commit: ff1d42e26bca3ce60697f9d4ee28f6aae5b7046b Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>