Fixed #22602 -- Improved code coverage of makemigrations command tests.

tests/migrations/test_migrations_no_changes/0003_third.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('migrations', '0002_second'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ModelWithCustomBase',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+            ],
+            options={
+            },
+            bases=(models.Model,),
+        ),
+        migrations.DeleteModel(
+            name='Author',
+        ),
+        migrations.DeleteModel(
+            name='Book',
+        ),
+    ]