[FIX] qweb: wrong result when use the value defined by the t-set
[FIX] qweb: wrong result when use the value defined by the t-set

When use t-set the value is replaced by an empty list and can't be use inside the t-set.

Issue: <t t-set="bibi"><t t-raw="bibi"/> other</t> => ["\n "] other

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