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

@skipUnlessDBFeature('supports_raster')
def test_add_blank_raster_field(self):

    self.alter_gis_model(migrations.AddField, 'Neighborhood', 'heatmap', True, fields.RasterField)
    self.assertColumnExists('gis_neighborhood', 'heatmap')
    if self.has_spatial_indexes:
        self.assertSpatialIndexExists('gis_neighborhood', 'heatmap', raster=True)
