add Django 1.7 migration for #718

wagtail/wagtailcore/migrations/0010_change_page_owner_to_null_on_delete.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import django.db.models.deletion
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('wagtailcore', '0009_remove_auto_now_add_from_pagerevision_created_at'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='page',
+            name='owner',
+            field=models.ForeignKey(related_name=b'owned_pages', on_delete=django.db.models.deletion.SET_NULL, blank=True, editable=False, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+    ]