[FIX]Issue on questions and sessions registrations

controllers/main.py

 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 import copy
+import werkzeug
 from ast import literal_eval
 from datetime import timedelta
 
@@ -532,17 +533,23 @@ class WebsiteEventController(WebsiteEventController):
 
 
 class WebsiteEvent(WebsiteEvent):
-    def _process_attendees_form(self, event, form_details):
+
+    @http.route()
+    def registration_confirm(self, event, **post):
+        if event.use_sessions:
+            registrations = self._process_attendees_form(event, post)
+            # Manage sessions registrations
+            registrations_sessions = self._process_attendees_form_sessions(event, post, registrations)
+            attendees_sudo = self._create_attendees_from_registration_post(event, registrations_sessions)
+            return request.redirect(('/event/%s/registration/success?' % event.id) + werkzeug.urls.url_encode({'registration_ids': ",".join([str(id) for id in attendees_sudo.ids])}))
+        else:
+            return super(WebsiteEvent, self).registration_confirm(event, **post)
+
+
+    def _process_attendees_form_sessions(self, event, form_details, registrations):
         """Process data posted from the attendee details form.
         Manage sessions registrations."""
-        registrations = super(WebsiteEvent, self)._process_attendees_form(
-            event, form_details
-        )
-
-        for registration in registrations:
-            registration["registration_answer_ids"] = []
         reg = []
-        general_answer_ids = []
         for key, _value in form_details.items():
             if "session_id" in key:
                 text, session_id = key.split("-")
@@ -550,10 +557,8 @@ class WebsiteEvent(WebsiteEvent):
                 registrations_sessions = copy.deepcopy(registrations)
                 for registration_session in registrations_sessions:
                     registration_session["session_id"] = int(session_id)
+                    registration_session['registration_answer_ids'] = []
                 reg += registrations_sessions
 
-        for registration in registrations:
-            registration["registration_answer_ids"].extend(general_answer_ids)
-
-        reg_total = registrations + reg
+        reg_total = reg + registrations
         return reg_total