Stop creating an empty session on first request

src/pretix/multidomain/middlewares.py

@@ -79,14 +79,6 @@ class SessionMiddleware(BaseSessionMiddleware):
     a custom domain.
     """
 
-    def process_request(self, request):
-        super().process_request(request)
-
-        if not request.session.session_key:
-            # We need to create session even if we do not yet store something there, because we need the session
-            # key for e.g. saving the user's cart
-            request.session.create()
-
     def process_response(self, request, response):
         try:
             accessed = request.session.accessed