Merge branch...

Merge branch '1895-channelviewset-exception-raised-while-getting-serializer-hint-is-get_serializer_class' into 'develop'

Resolve "ChannelViewSet: exception raised while getting serializer. Hint: Is get_serializer_class() returning None or is get_queryset() not working without a request? Ignoring the view for now. (Exception: 'NoneType' object is not callable)"

Closes #1895

See merge request !2015
11 jobs for !2015 with 1895-channelviewset-exception-raised-while-getting-serializer-hint-is-get_serializer_class into develop in 28 minutes and 5 seconds (queued for 1 second)