[FIX] website_mail_channel: fix member count

Was showing 0 for the public user

addons/website_mail_channel/controllers/main.py

@@ -49,7 +49,10 @@ class MailGroup(http.Controller):
             [], ['res_id'])
         message_data = dict((message['res_id'], message['res_id_count']) for message in messages)
 
-        group_data = dict((group.id, {'monthly_message_nbr': message_data.get(group.id, 0)}) for group in groups)
+        group_data = dict(
+            (group.id, {'monthly_message_nbr': message_data.get(group.id, 0),
+                        'members_count': len(group.channel_partner_ids)})
+            for group in groups.sudo())
         return request.render('website_mail_channel.mail_channels', {'groups': groups, 'group_data': group_data})
 
     @http.route(["/groups/is_member"], type='json', auth="public", website=True)

addons/website_mail_channel/views/website_mail_channel_templates.xml

@@ -50,7 +50,7 @@
                     <div t-esc="group.description" class="text-muted"/>
                 </div>
                 <div class="col-md-2">
-                    <i class='fa fa-fw fa-user'/> <t t-esc="len(group.channel_partner_ids)"/> members<br />
+                    <i class='fa fa-fw fa-user'/> <t t-esc="group_data[group.id]['members_count']"/> members<br />
                     <i class='fa fa-fw fa-envelope-o'/> <t t-raw="group_data[group.id]['monthly_message_nbr']"/> messages / month
                 </div>
                 <div class="col-md-3">