[FIX] auth_oauth: dup fail if odoo oauth provider removed
[FIX] auth_oauth: dup fail if odoo oauth provider removed

It is unwise to delete it (it can simply be disabled) but it can be done
(and other part of the code take it into account).

opw-703196

ygol/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,dfang/odoo,laslabs/odoo,bplancher/odoo,storm-computers/odoo,storm-computers/odoo,hip-odoo/odoo,hip-odoo/odoo,bplancher/odoo,ygol/odoo,ygol/odoo,Elico-Corp/odoo_OCB,ygol/odoo,bplancher/odoo,bplancher/odoo,storm-computers/odoo,dfang/odoo,laslabs/odoo,dfang/odoo,hip-odoo/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,hip-odoo/odoo,storm-computers/odoo,storm-computers/odoo,ygol/odoo,bplancher/odoo,ygol/odoo,dfang/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,ygol/odoo,laslabs/odoo,storm-computers/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,dfang/odoo