[IMP] website_blog: avoid searching all blogs twice
[IMP] website_blog: avoid searching all blogs twice

The same `search` was done twice in a row.

Part of task-2061122

closes odoo/odoo#36485

Signed-off-by: Jérémy Kersten (jke) <56923a0c9ca793c07ff1df1013de5694062a27a6@openerp.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo