Skipped a test on Oracle

tests/regressiontests/generic_relations_regress/tests.py

@@ -1,6 +1,6 @@
 from django.db.models import Q
 from django.db.utils import IntegrityError
-from django.test import TestCase
+from django.test import TestCase, skipIfDBFeature
 
 from .models import (Address, Place, Restaurant, Link, CharLink, TextLink,
     Person, Contact, Note, Organization, OddRelation1, OddRelation2, Company,
@@ -127,6 +127,7 @@ class GenericRelationTests(TestCase):
         note = Note(note='Note for guild', content_object=g1)
         note.save()
 
+    @skipIfDBFeature('interprets_empty_strings_as_nulls')
     def test_gfk_to_model_with_empty_pk(self):
         """Test related to #13085"""
         # Saving model with GenericForeignKey to model instance with an