[Pkg-mailman-hackers] Bug#891937: mailman3-suite: Hyperkitty tries to connect postgres on system using sqlite

[Markus Gschwendt]

Package: mailman3
Version: 3.1.1
System: debian stretch-backports

Fresh install with sqlite as DB.
Hyperkitty tries to connect postgres on system using sqlite.
Postgres is not installed on this system.

Mail from (hourly) cronjob:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-
packages/django_extensions/management/commands/runjobs.py", line 34, in
runjobs
    job().execute()
  File "/usr/lib/python2.7/dist-
packages/hyperkitty/jobs/thread_starting_email.py", line 39, in execute
    starting_email__isnull=True).all():
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 250, in __iter__
    self._fetch_all()
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 1118, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
  File "/usr/lib/python2.7/dist-
packages/django/db/models/sql/compiler.py", line 887, in execute_sql
    cursor = self.connection.cursor()
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/base/base.py", line 254, in cursor
    return self._cursor()
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/base/base.py", line 229, in _cursor
    self.ensure_connection()
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/base/base.py", line 213, in
ensure_connection
    self.connect()
  File "/usr/lib/python2.7/dist-packages/django/db/utils.py", line 94,
in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/base/base.py", line 213, in
ensure_connection
    self.connect()
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/base/base.py", line 189, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/postgresql/base.py", line 176, in
get_new_connection
    connection = Database.connect(**conn_params)
  File "/usr/lib/python2.7/dist-packages/psycopg2/__init__.py", line
164, in connect
    conn = _connect(dsn, connection_factory=connection_factory,
async=async)
OperationalError: could not connect to server: No such file or
directory
        Is the server running locally and accepting
        connections on Unix domain socket
"/var/run/postgresql/.s.PGSQL.5432"?

ERROR OCCURED IN HOURLY JOB: thread_starting_email (APP: hyperkitty)
START TRACEBACK:
END TRACEBACK