Current behavior: When trying to create an expense using alias, if a `hr.employee` not linked to a user want to, he won't be able This bug occurs after this [commit](https://github.com/odoo/odoo/commit/fbeb7aebcadbe77ff7774b538550373650b329fe) Steps to reproduce the error : - Create an employee not related to a user - Configure alias for expenses - Try to send an email to the expense's alias and check at the logs After this commit: Employees without a related user will be able to create an expense from an email alias opw-3892778 opw-3892701 opw-3893319 opw-3893591 closes odoo/odoo#163672 X-original-commit: 1dd67119c27d219eac2b726ef88cc4af3bed2814 Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>