[IMP] mail: don't send attachment if the link is in the email
[IMP] mail: don't send attachment if the link is in the email

If the user send an email with a '/web/content' or /web/image' link in
the body, the attachment are not send by email to not to increase the
size of the email unnecessarily.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo