Currently when creating a composer in mass mode the composer always shows the 'mass mailing name' option even when a mailing cannot be created. This silently creates a regular mass mail. This hides that option when selecting records of models that do not inherit from thread. So that users do not falsly believe a mailing will be created. task #2990447 closes odoo/odoo#102105 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>