This commit fixes a behavior when we send a batch of mailings with no recipients. When there is no recipients passed down, each mailing should use it's own recipients and not the recipients of the first mailing. closes odoo/odoo#75652 X-original-commit: 88d74fde5ce1ec70a88679429fda02180ce7fa81 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>