Before this commit, an Outlook event without an organizer would fail to sync with Odoo. This commit fixes this issue by allowing events without an organizer to be synced from Outlook to Odoo. opw-3701839 closes odoo/odoo#153683 X-original-commit: 4f441aa083413e475728f4f510afdbb9f15a26ef Signed-off-by: Arnaud Joset (arj) <arj@odoo.com>