Before this commit, it was impossible to empty a many2one in a list view.
How to reproduce:
- go into a list view with a many2one
- empty a many2one containing a value
- click outside the line
Before this commit:
The record goes into readonly mode and its many2one returns to
its original value.
After this commit:
The record is saved and its many2one is empty.
closesodoo/odoo#99140
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>