Before this commit, the list view crashed when it was grouped if there was a button column in between two "aggregatable" fields columns. The reason is that "formatAggragatableValue" makes sense only on field columns, and it crashes when called on a column of another type. It was for instance the case in the Stock > Locations list view. closes odoo/odoo#99289 Signed-off-by: Georis François (fge) <fge@odoo.com>