[FIX] _validate_taxes and _get_tax_codes methods
[FIX] _validate_taxes and _get_tax_codes methods

thinkopensolutions/l10n-brazil,odoo-brazil/l10n-brazil-wip,odoo-brazil/l10n-brazil-wip,rvalyi/l10n-brazil,thinkopensolutions/l10n-brazil,rvalyi/l10n-brazil