AURA installation fails due to missing "biography" for program_host in fixtures

Invoking docker compose run --rm steering initialize fails as program_host.biography must not be NULL in the current database version:

poetry run ./manage.py loaddata fixtures/*/*.json
Traceback (most recent call last):
  File "/app/.cache/virtualenvs/steering-9TtSrW0h-py3.10/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
psycopg2.errors.NotNullViolation: null value in column "biography" of relation "program_host" violates not-null constraint
DETAIL:  Failing row contains (1, Musikredaktion, , t, 2000-06-01 00:00:00+00, loaddata, null, null, , null).

An empty string should be sufficient.