Before this commit, when creating a new record using the quick create on
a kanban view, a flickering was visible. We can see the quick create
form disappear, the record list goes up, the quick create form re-appear
and the record list goes down again.

This occurs because, the record list contains an empty record that is
used on the quick create form. When clicking on the add button on the
quick create form, this record is directly saved, and as is already on
the list (the quick create form disappear and the record list goes up),
only after this action, a new empty record is created and added to the
list (the quick create form re-appear and the record list goes down
again).

Now, an empty record is created independently of the list, so when we
click on the add button on the quick create form, the record is saved,
a new empty record is created (the quick create form is emptied), and
the saved record is added to the list (the record list got the new saved
record), avoiding the flickering.

task-id=3085247

closes odoo/odoo#111818

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>