Django validate queryset None

Question

I have a queryset in order to check if the result is Null or exists

cupon_existente =  Orden.objects.filter(user = self.request.user, ordenado= False).values_list('promo', flat=True)

when the result is 'None' and I want to validate like this:

if cupon_existente:
   True
else:
   False

it validates as 'True'

how can I validate that None is actually 'False' or 'NULL' ?

Jorge López · Answer

what I did to catch the None as empty or null was:

if cupon_existente is None:
   messages.warning(self.request, "Ya tiene un cupón aplicado")
   return redirect("pago-cupon")

I added the is None validation