To that end, we will now do the VIES and regular VAT
check separately.
The VAT check stays as a constrains, while the VIES
check will now be done in an onchange and simply
display a warning if it fails.
We will also now allow VAT with a single character to
ignore the checks. This will allow users to better
distinguish partners for which they didn't enter VAT
against partners which are not subject to VAT by setting
the later's VAT to '/' or any other characters.
Task id #3138441
X-original-commit: eff3b140cc88dd48b77948a577f195f2e1910fd8
Part-of: odoo/odoo#111324
Nicolas (vin)
98a225f4d2