def test_apply_with_empty_cell_data(self):
# given:
cell_conversion = LinkedExternalReferenceCellConversion(
'user.uuid', 'account')
# and:
metadata = MetadataEntity()
# when:
cell_conversion.apply(metadata, '')
# then:
self.assertFalse(
metadata.get_external_links('account'),
'When cell is empty, no external link should be added')
