[IMP] mail: display latest records first when previewing templates

And also avoid resetting the body if there is no record chosen.

Closes #18566 .

1 files changed, 4 insertions, 2 deletions

diff --git a/addons/mail/wizard/email_template_preview.py b/addons/mail/wizard/email_template_preview.py
index 678dbfa3ee5..89808b0b6d1 100644
--- a/addons/mail/wizard/email_template_preview.py
+++ b/addons/mail/wizard/email_template_preview.py
@@ -17,7 +17,7 @@ class TemplatePreview(models.TransientModel):
         if not template_id:
             return []
         template = self.env['mail.template'].browse(int(template_id))
-        records = self.env[template.model_id.model].search([], limit=10)
+        records = self.env[template.model_id.model].search([], order="id desc", limit=10)
         records |= records.browse(default_res_id)
         return records.name_get()
 
@@ -38,8 +38,10 @@ class TemplatePreview(models.TransientModel):
     @api.onchange('res_id')
     @api.multi
     def on_change_res_id(self):
+        if not self.res_id:
+            return {}
         mail_values = {}
-        if self.res_id and self._context.get('template_id'):
+        if self._context.get('template_id'):
             template = self.env['mail.template'].browse(self._context['template_id'])
             self.name = template.name
             mail_values = template.generate_email(self.res_id)