Fixed #24862 -- Improved PostGIS database connection error message

        if hasattr(settings, 'POSTGIS_VERSION'):

            version = settings.POSTGIS_VERSION

        else:

            # Run a basic query to check the status of the connection so we're

            # sure we only raise the error below if the problem comes from

            # PostGIS and not from PostgreSQL itself (see #24862).

            self._get_postgis_func('version')

            try:

                vtup = self.postgis_version_tuple()

            except ProgrammingError:

                raise ImproperlyConfigured(

                    'Cannot determine PostGIS version for database "%s". '

                    'Cannot determine PostGIS version for database "%s" '

                    'using command "SELECT postgis_lib_version()". '

                    'GeoDjango requires at least PostGIS version 2.0. '

                    'Was the database created from a spatial database '

                    'template?' % self.connection.settings_dict['NAME']