@ -767,7 +767,7 @@ in a single call.")
prefetch_var_name_to_block_id.extend(
lookup_table_var_name_to_block_id)
if optimize_blocks.size() == 0:
if len(optimize_blocks) == 0:
pre_block_idx = pserver_program.num_blocks - 1
empty_block = pserver_program._create_block(pre_block_idx)
optimize_blocks.append(empty_block)