models: make Journal.actor nullable

src/authentic2_cut/migrations/0005_auto_20200515_1616.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-05-15 14:16
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('authentic2_cut', '0004_auto_20180801_1147'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='journal',
+            name='actor',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='actor_journal', to=settings.AUTH_USER_MODEL, verbose_name='Auteur'),
+        ),
+    ]

src/authentic2_cut/models.py

@@ -25,6 +25,7 @@ class Journal(models.Model):
         auto_now_add=True)
     actor = models.ForeignKey(
         settings.AUTH_USER_MODEL,
+        null=True,
         verbose_name=u'Auteur',
         related_name='actor_journal',
         on_delete=models.SET_NULL)