From 6539ac88d8c454ce274771908d7b31001c922327 Mon Sep 17 00:00:00 2001
From: Christian Cueni <christian.cueni@iterativ.ch>
Date: Mon, 29 Nov 2021 12:04:28 +0100
Subject: [PATCH] Make old_type optional

---
 .../migrations/0014_auto_20211129_1038.py      | 18 ++++++++++++++++++
 server/basicknowledge/models.py                |  3 ++-
 server/rooms/wagtail_hooks.py                  |  3 +++
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 server/basicknowledge/migrations/0014_auto_20211129_1038.py

diff --git a/server/basicknowledge/migrations/0014_auto_20211129_1038.py b/server/basicknowledge/migrations/0014_auto_20211129_1038.py
new file mode 100644
index 00000000..3eb2f9e6
--- /dev/null
+++ b/server/basicknowledge/migrations/0014_auto_20211129_1038.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.24 on 2021-11-29 10:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('basicknowledge', '0013_auto_20211110_1140'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='basicknowledge',
+            name='old_type',
+            field=models.CharField(blank=True, choices=[('language_communication', 'Sprache & Kommunikation'), ('society', 'Gesellschaft'), ('interdisciplinary', 'Überfachliches Instrument')], max_length=100),
+        ),
+    ]
diff --git a/server/basicknowledge/models.py b/server/basicknowledge/models.py
index 5b5ae791..28444977 100644
--- a/server/basicknowledge/models.py
+++ b/server/basicknowledge/models.py
@@ -57,7 +57,8 @@ class BasicKnowledge(StrictHierarchyPage):
 
     old_type = models.CharField(
         max_length=100,
-        choices=InstrumentType.CATEGORY_CHOICES
+        choices=InstrumentType.CATEGORY_CHOICES,
+        blank=True
     )
 
     content_panels = [
diff --git a/server/rooms/wagtail_hooks.py b/server/rooms/wagtail_hooks.py
index 047ce7ac..7ce1475d 100644
--- a/server/rooms/wagtail_hooks.py
+++ b/server/rooms/wagtail_hooks.py
@@ -34,6 +34,9 @@ def get_room_blocks(page):
 
 
 def get_block_from_stream_data(stream_data, block_name):
+    if len(stream_data) == 0:
+        return []
+
     if isinstance(stream_data[0], tuple):
         return [block for block in stream_data if block[0] in [block_name]]
     if isinstance(stream_data[0], dict):