Allow to exclude items from ticket generation explicitly

src/pretix/base/migrations/0108_auto_20190201_1527.py

@@ -0,0 +1,21 @@
+# Generated by Django 2.1.5 on 2019-02-01 15:27
+
+from django.db import migrations, models
+import django.db.models.deletion
+import jsonfallback.fields
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0107_auto_20190129_1337'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='item',
+            name='generate_tickets',
+            field=models.NullBooleanField(verbose_name='Allow ticket download'),
+        ),
+    ]