Make .validated and .validated_by non required (#24339)

So we can edit validation requests in the admin.

src/authentic2_cut/migrations/0004_auto_20180801_1147.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('authentic2_cut', '0003_auto_20180423_1532'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='validationrequest',
+            name='reason',
+            field=models.TextField(blank=True, verbose_name='Raison du refus', choices=[(b'unreadable', 'Pi\xe8ce(s) illisible(s)'), (b'invalid', 'Pi\xe8ce(s) invalides(s)'), (b'underaged', 'Invividu mineur')]),
+        ),
+        migrations.AlterField(
+            model_name='validationrequest',
+            name='validated',
+            field=models.DateTimeField(null=True, verbose_name='Date de validation', blank=True),
+        ),
+        migrations.AlterField(
+            model_name='validationrequest',
+            name='validated_by',
+            field=models.ForeignKey(related_name='validation_requests_validated', verbose_name='Valid\xe9/refus\xe9 par', blank=True, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+    ]

src/authentic2_cut/models.py

@@ -115,11 +115,13 @@ class ValidationRequest(models.Model):
         verbose_name=u'Raison du refus')
     validated = models.DateTimeField(
         null=True,
+        blank=True,
         verbose_name=u'Date de validation')
     validated_by = models.ForeignKey(
         settings.AUTH_USER_MODEL,
         verbose_name=u'Validé/refusé par',
         null=True,
+        blank=True,
         related_name='validation_requests_validated')
     external_id = models.TextField(
         blank=True,