HStoreField maps to ListField(CharField(allow_blank=True). Closes #2659.

Author: tomchristie

rest_framework/serializers.py

@@ -1430,7 +1430,7 @@ def get_unique_for_date_validators(self):
 
 if postgres_fields:
     class CharMappingField(DictField):
-        child = CharField()
+        child = CharField(allow_blank=True)
 
     ModelSerializer.serializer_field_mapping[postgres_fields.HStoreField] = CharMappingField
     ModelSerializer.serializer_field_mapping[postgres_fields.ArrayField] = ListField