"openquake --version" with DJANGO_SETTINGS_MODULE unset raises ugly exception

[Muharem Hrnjadovic]

Traceback (most recent call last):
  File "/usr/bin/openquake", line 69, in <module>
    from openquake.export import core as export
  File "/usr/lib/pymodules/python2.7/openquake/export/core.py", line 23, in <module>
    from openquake.db import models
  File "/usr/lib/pymodules/python2.7/openquake/db/models.py", line 32, in <module>
    from django.contrib.gis.db import models as djm
  File "/usr/lib/python2.7/dist-packages/django/contrib/gis/db/models/__init__.py", line 2, in <module>
    from django.db.models import *
  File "/usr/lib/python2.7/dist-packages/django/db/__init__.py", line 14, in <module>
    if not settings.DATABASES:
  File "/usr/lib/python2.7/dist-packages/django/utils/functional.py", line 276, in __getattr__
    self._setup()
  File "/usr/lib/python2.7/dist-packages/django/conf/__init__.py", line 40, in _setup
    raise ImportError("Settings cannot be imported, because environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
ImportError: Settings cannot be imported, because environment variable DJANGO_SETTINGS_MODULE is undefined.