Fixed #22276 -- Fixed crash when formset management form is invalid.

Co-authored-by: Patryk Zawadzki <patrys@room-303.com>

tests/model_formsets/tests.py

@@ -4,7 +4,7 @@ from datetime import date
 from decimal import Decimal
 
 from django import forms
-from django.core.exceptions import ImproperlyConfigured, ValidationError
+from django.core.exceptions import ImproperlyConfigured
 from django.db import models
 from django.forms.models import (
     BaseModelFormSet, _get_foreign_key, inlineformset_factory,
@@ -1783,11 +1783,10 @@ class ModelFormsetTest(TestCase):
             [{'id': ['Select a valid choice. That choice is not one of the available choices.']}],
         )
 
-    def test_initial_form_count_empty_data_raises_validation_error(self):
+    def test_initial_form_count_empty_data(self):
         AuthorFormSet = modelformset_factory(Author, fields='__all__')
-        msg = 'ManagementForm data is missing or has been tampered with'
-        with self.assertRaisesMessage(ValidationError, msg):
-            AuthorFormSet({}).initial_form_count()
+        formset = AuthorFormSet({})
+        self.assertEqual(formset.initial_form_count(), 0)
 
 
 class TestModelFormsetOverridesTroughFormMeta(TestCase):