Fixed #26813 -- Prevented empty choice in ModelChoiceField with RadioSelect for fields with blank=False.

tests/model_forms/tests.py

@@ -273,6 +273,23 @@ class ModelFormBaseTest(TestCase):
             (writer.pk, 'Joe Doe'),
         ])
 
+    def test_non_blank_foreign_key_with_radio(self):
+        class AwardForm(forms.ModelForm):
+            class Meta:
+                model = Award
+                fields = ['character']
+                widgets = {'character': forms.RadioSelect()}
+
+        character = Character.objects.create(
+            username='user',
+            last_action=datetime.datetime.today(),
+        )
+        form = AwardForm()
+        self.assertEqual(
+            list(form.fields['character'].choices),
+            [(character.pk, 'user')],
+        )
+
     def test_save_blank_false_with_required_false(self):
         """
         A ModelForm with a model with a field set to blank=False and the form