django - query filter on manytomany is empty

Adding to @Bernhard answer, other possible solution can be achieved using the Q() object.

from django.db.models import Q

filters = Q(manytomany=None)

TestModel.objects.filter(filters)

Negation:

filters = ~Q(manytomany=None)

TestModel.objects.filter(filters)

print TestModel.objects.filter(manytomany=None)

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