[FIX] mail: prevent session expired with channel_info for guest

closes odoo/odoo#77561

X-original-commit: e1c68fa4e3dbbdedce45a86f404ded2350c7b46c
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js

@@ -278,6 +278,9 @@ function factory(dependencies) {
                 id: channelId,
                 model: 'mail.channel',
             });
+            if (!channel && this.messaging.isCurrentUserGuest) {
+                return; // guests should not receive messages for channels they don't know, and they can't make the channel_info RPC
+            }
             const wasChannelExisting = !!channel;
             const convertedData = this.messaging.models['mail.message'].convertData(messageData);