With(empty_qs) throws Error

[ford-carta]

Got this error when I had an empty query set in a With clause.

AttributeError: 'CTEQueryCompiler' object has no attribute 'col_count'

[hstanev]

I managed to work around this by changing my queryset from
MyModel.objects.filter(pk__in=[])
to
MyModel.objects.filter(pk=None)

It appears that what triggers the problem is your queryset becoming a queryset.none(), so I chose to simply prevent that by changing the filter with something that would otherwise yield the same empty result from the queryset.