JSONField with blank/null value?

[Jeff Johnson]

Hi,

I've been struggling to save a null value to a Postgres 9.6 JSON field using DRF.  I'm testing with the Browsable API if that makes a difference.

class MyModel(models.Model):
    data = JSONField(blank=True, null=True)

class MyModelSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = MyModel
        fields = (
            'url',

            'data',

        )

The validator says "Value must be valid JSON." when I leave the value blank.  
I've tried every combination of required, allow_null, default that I can think of and nothing works.

Any help?

Thanks,
Jeff