diff -r fb0041aa74d3 -r 95536fa18d0d server/python2/django/renkanmanager/migrations/0002_alter_models_and_populate_revisions.py
--- a/server/python2/django/renkanmanager/migrations/0002_alter_models_and_populate_revisions.py	Mon Jan 11 18:24:14 2016 +0100
+++ b/server/python2/django/renkanmanager/migrations/0002_alter_models_and_populate_revisions.py	Tue Jan 26 17:18:04 2016 +0100
@@ -38,7 +38,7 @@
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('revision_guid', models.CharField(default=uuid.uuid4, unique=True, max_length=256)),
                 ('parent_renkan_guid', models.CharField(max_length=256)),
-                ('title', models.CharField(max_length=1024, null=True)),
+                ('title', models.CharField(max_length=1024, null=True, blank=True)),
                 ('content', models.TextField(null=True, blank=True)),
                 ('creation_date', models.DateTimeField(auto_now_add=True)),
                 ('modification_date', models.DateTimeField(auto_now=True)),