# empty collection
pdh = collection.portable_data_hash()
assert (pdh == config.EMPTY_BLOCK_LOCATOR), "Empty collection portable_data_hash did not have expected locator, was %s" % pdh
# empty collection
pdh = collection.portable_data_hash()
assert (pdh == config.EMPTY_BLOCK_LOCATOR), "Empty collection portable_data_hash did not have expected locator, was %s" % pdh