Let's assume a <groupby> node in a list view containing a button
with an invisible modifier referencing a many2one field, e.g.
```
<tree>
<groupby>
<field name="m2o" invisible="1"/>
<button string="do it" attrs="{'invisible': [('m2o', '=',
False)]}"/>
</groupby>
</tree>
```
Before this commit, the m2o field was correctly read, but it's
value wasn't processed by the model, so the modifier wasn't
correctly evaluated.
Issue reported on PR https://github.com/odoo/odoo/pull/65316/closesodoo/odoo#66330
X-original-commit: fa7a185663f21c1c4060765c8c137b296df3a350
Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>