Create missing migration for site default value and model managers

favicon/migrations/0003_site_manager.py

+# Generated by Django 3.0.4 on 2020-05-04 16:21
+
+import django.contrib.sites.managers
+from django.db import migrations, models
+import django.db.models.deletion
+import django.db.models.manager
+from django.conf import settings
+
+
+use_sites = hasattr(settings, "SITE_ID")
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('favicon', '0002_favicon_site'),
+    ]
+
+    operations = [
+        migrations.AlterModelManagers(
+            name='favicon',
+            managers=[
+                ('objects', django.db.models.manager.Manager()),
+                ('on_site', django.contrib.sites.managers.CurrentSiteManager()),
+            ] if use_sites else [
+                ('objects', django.db.models.manager.Manager()),
+                ('on_site', django.db.models.manager.Manager()),
+            ],
+        ),
+    ]
+    if use_sites:
+        operations.append(
+            migrations.AlterField(
+            model_name='favicon',
+            name='site',
+            field=models.ForeignKey(blank=True, default=1, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='favicon', to='sites.Site'),
+            )
+        )