Change default of ReviewerSettings.min_interval to null - if it's not

specified for a reviewer, we don't take it into account
 - Legacy-Id: 12169

ietf/review/migrations/0003_auto_20161018_0254.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('review', '0002_auto_20161017_1218'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='reviewersettings',
+            name='min_interval',
+            field=models.IntegerField(blank=True, null=True, verbose_name=b'Can review at most', choices=[(7, b'Once per week'), (14, b'Once per fortnight'), (30, b'Once per month'), (61, b'Once per two months'), (91, b'Once per quarter')]),
+            preserve_default=True,
+        ),
+    ]