ODKScan_webapp.UserFormCondition.autofill: (1_6.W002) BooleanField does not have a default value

pmb@pmb-superserver:/pmb/www/scanadmin$ sudo python manage.py daemon

[sudo] password for pmb:

System check identified some issues:

WARNINGS:

ODKScan_webapp.UserFormCondition.autofill: (1_6.W002) BooleanField does not have a default value.

HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information.

ODKScan_webapp.UserFormCondition.formView: (1_6.W002) BooleanField does not have a default value.

HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information.

ODKScan_webapp.UserFormCondition.showSegs: (1_6.W002) BooleanField does not have a default value.

HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information.

ODKScan_webapp.UserFormCondition.tableView: (1_6.W002) BooleanField does not have a default value.

HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information.

pmb@pmb-superserver:/pmb/www/scanadmin$ python --version

Python 2.7.6