The master branch of lava-server has now moved to a requirement for django 1.8 or better. (1.9 is available in Debian unstable and testing, 1.8 from jessie-backports.)
To install or upgrade lava-server on jessie, python-django and python-django-tables2 must be installed from jessie-backports.
Once master is merged into staging and then into release for the next production release, this change will affect all builds of lava-server available for Debian other than 2014.9 already in jessie. All users of lava-server are strongly recommended to upgrade from 2014.9 for security and bug fix support in the underlying django code. Installations using jessie-backports are fully supported and will become the requirement after the next production release.
django1.7 is now out of upstream support whilst django1.8 retains upstream support and updates through backports until at least April 2018.
https://www.djangoproject.com/download/
lava-dispatcher is unaffected.