supporter description can be null

Signed-off-by: rscnt <rascnt@gmail.com>

digitalglarus/migrations/0007_auto_20160208_1031.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('digitalglarus', '0006_dggallery_dggalleryplugin_dgpicture'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='supporter',
+            name='description',
+            field=models.TextField(blank=True, null=True),
+            preserve_default=True,
+        ),
+    ]