Now look for `DatabaseError` during PostGIS backend initialization, as it is...

from django.contrib.gis.geometry.backend import Geometry

from django.contrib.gis.measure import Distance

from django.core.exceptions import ImproperlyConfigured

from django.db.backends.postgresql_psycopg2.base import Database, DatabaseOperations

from django.db.backends.postgresql_psycopg2.base import DatabaseOperations

from django.db.utils import DatabaseError

#### Classes used in constructing PostGIS spatial SQL ####

class PostGISOperator(SpatialOperation):

            self.geom_func_prefix = prefix

            self.spatial_version = version

        except Database.ProgrammingError:

        except DatabaseError:

            raise ImproperlyConfigured('Cannot determine PostGIS version for database "%s". '

                                       'GeoDjango requires at least PostGIS version 1.3. '

                                       'Was the database created from a spatial database '