Fixes field causing form invalidation when editing books

bookwyrm/migrations/0012_auto_20201124_2125.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-11-24 21:25
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0011_auto_20201113_1727'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='book',
+            name='origin_id',
+            field=models.CharField(blank=True, max_length=255, null=True),
+        ),
+    ]