In a form view, modify a record s.t. a required field is unset,
and then click on the pager to navigate to the next or previous
record. Before this commit, a notification was displayed (because
a required field is unset), but we switched to the other record
anyway.
This commit restores the desired behavior, which is to stay on the
current record to let the user fix it or discard it.
closesodoo/odoo#100050
Signed-off-by: Géry Debongnie <ged@odoo.com>