[FIX] web: one2many and onchange corner case issue

Let's assume a one2many list view inside a form view, displaying
a single char field A. There is an onchange on the form view
returning a command 0 (CREATE) for the one2many. The command 0 only
specifies a value for field A. The one2many list isn't editable, so
when a sub-record is clicked, it is open in a form view (in a
dialog). In this form view, an x2many field B is displayed in a sub
list or kanban view.

Before this rev., it crashed when the user tried to open the
created one2many sub-record (returned by the onchange) in the form
view, because of the presence of the x2many field B, which wasn't
correctly processed by the BasicModel (its value was undefined,
whereas it must be a valid, empty, dataPoint).

Moreover, the limit of the x2many field B wasn't set, so a pager
was displayed as soon as it contained at least one record.

Fixes #22050

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