fix test for django CMS 4.1/5.0

Author: fsbraun

tests/test_admin.py

@@ -3433,6 +3433,7 @@ def test_poll_grouper_changelist_queries_are_optimized(self):
         # Create request
         factory = RequestFactory()
         request = factory.get("/admin/polls/poll/")
+        request.session = {}
         request.user = self.get_superuser()
 
         # Pin the number of queries
@@ -3467,6 +3468,7 @@ def test_poll_changelist_with_many_versions_scales_well(self):
         factory = RequestFactory()
         request = factory.get("/admin/polls/poll/")
         request.user = self.get_superuser()
+        request.session = {}
 
         # Query count should remain the same regardless of version count
         # because of prefetch optimization