Get rid of django.utils.log.NullHandler class in local_settings.py

debian/changelog

@@ -1,4 +1,4 @@
-horizon (2:9.0.0-3) UNRELEASED; urgency=medium
+horizon (2:9.0.0-3) unstable; urgency=medium
 
   [ Ondřej Nový ]
   * d/copyright: Changed source URL to https protocol
@@ -7,6 +7,9 @@ horizon (2:9.0.0-3) UNRELEASED; urgency=medium
   * d/openstack-dashboard.{preinst,postinst,postrm},
       openstack-dashboard-apache.{preinst,postinst,postrm}:
       - Pass the correct version to dpkg-maintscript-helper script.
+  * d/openstack-dashboard.postinst:
+      - Check if django.utils.log.NullHandler class is being used and
+        replace it with logging.NullHandler class if it is true. (Closes: #822907)
 
   [ Thomas Goirand ]
   * Horizon doesn't build with python-django-nose in Jessie, so increasing the

debian/openstack-dashboard.postinst

@@ -16,10 +16,13 @@ if [ "$1" = "configure" ] ; then
 	chown www-data:www-data /var/lib/openstack-dashboard/secret-key
 
 	mkdir -p /etc/openstack-dashboard
-	if ! [ -f /etc/openstack-dashboard/local_settings.py ] ; then
-		cp /usr/share/openstack-dashboard/local_settings.py /etc/openstack-dashboard/local_settings.py
+	DASHBOARD_LOCAL_SETTINGS='/etc/openstack-dashboard/local_settings.py'
+	if ! [ -f "$DASHBOARD_LOCAL_SETTINGS" ] ; then
+		cp /usr/share/openstack-dashboard/local_settings.py $DASHBOARD_LOCAL_SETTINGS
+	fi
+	if [ -f "$DASHBOARD_LOCAL_SETTINGS" ] && grep -q 'django.utils.log.NullHandler' $DASHBOARD_LOCAL_SETTINGS; then
+		sed -i 's/django.utils.log.NullHandler/logging.NullHandler/g' $DASHBOARD_LOCAL_SETTINGS
 	fi
-
 	if [ -L /usr/share/openstack-dashboard/static ]; then
 		if ! [ $(readlink -s /usr/share/openstack-dashboard/static) = /var/lib/openstack-dashboard/static ]; then
 			ln -fs /var/lib/openstack-dashboard/static /usr/share/openstack-dashboard/static