Fix meeting creation in Django test suite

tests/test_django/_test_base.py

@@ -21,7 +21,7 @@ class TestBase(TestCase):
         self.api.save()
 
         # Set up a test meeting for later reference
-        self.meeting = Meeting(name="Meeting from setUp", api=self.api)
+        self.meeting = Meeting(name="Meeting from setUp", api_group=self.group)
         self.meeting.save()
 
         # Mock the _request method to not ever send off requests