[IMP] google_drive : allow to remove drive access token
[IMP] google_drive : allow to remove drive access token

Before, we submitting empty token field on General Settings, it did not remove the token from database.

ygol/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo