[FIX] mass_mailing: Select records with Leads / Opps as recipients

`False` is not syntax valid for a domain.
It leads to errors when trying to evaluate `False`
as a domain in the evaluation of `pyeval.js`.

Therefore, using `False` as default value for `mailing_domain`
isn't correct

opw-648857

Author: beledouxdenis

addons/mass_mailing/models/mass_mailing.py

@@ -461,6 +461,7 @@ def default_get(self, cr, uid, fields, context=None):
         'reply_to': lambda self, cr, uid, ctx=None: self.pool['mail.message']._get_default_from(cr, uid, context=ctx),
         'mailing_model': 'mail.mass_mailing.contact',
         'contact_ab_pc': 100,
+        'mailing_domain': [],
     }
 
     #------------------------------------------------------
@@ -517,7 +518,7 @@ def on_change_model_and_list(self, cr, uid, ids, mailing_model, list_ids, contex
             else:
                 value['mailing_domain'] = "[('list_id', '=', False)]"
         else:
-            value['mailing_domain'] = False
+            value['mailing_domain'] = []
         return {'value': value}
 
     def action_duplicate(self, cr, uid, ids, context=None):