Passing a field containing `undefined` should lead to the same result as not
passing the field.
Fields that relied on `undefined` as a value have been changed to use the newly
introduced `clear` command, that resets a field to its default value (often
that is equal to `undefined`).
task-2336491
closesodoo/odoo#58314
X-original-commit: b18824485483564d2ab80f41914a3548aa528ae0
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
