Add hidden questions

src/pretix/base/migrations/0119_auto_20190509_0654.py

@@ -0,0 +1,21 @@
+# Generated by Django 2.2 on 2019-05-09 06:54
+
+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', '0118_auto_20190423_0839'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='hidden',
+            field=models.BooleanField(default=False, help_text='This question will only show up in the backend.', verbose_name='Hidden question'),
+        ),
+    ]