'Should be able to add a GeometryField with blank=True.'

def test_add_blank_geom_field(self):

    self.alter_gis_model(migrations.AddField, 'Neighborhood', 'path', True, fields.LineStringField)
    self.assertColumnExists('gis_neighborhood', 'path')
    if HAS_GEOMETRY_COLUMNS:
        self.assertGeometryColumnsCount(2)
    if self.has_spatial_indexes:
        self.assertSpatialIndexExists('gis_neighborhood', 'path')
