permit blank

src/shop/migrations/0038_auto_20170323_2021.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-03-23 19:21
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shop', '0037_auto_20170319_2204'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='order',
+            name='payment_method',
+            field=models.CharField(blank=True, choices=[('credit_card', 'Credit card'), ('blockchain', 'Blockchain'), ('bank_transfer', 'Bank transfer'), ('cash', 'Cash')], default='', max_length=50),
+        ),
+    ]

src/shop/models.py

@@ -95,6 +95,7 @@ class Order(CreatedUpdatedModel):
         max_length=50,
         choices=PAYMENT_METHOD_CHOICES,
         default='',
+        blank=True
     )
 
     cancelled = models.BooleanField(default=False)