fix list index out of range error (#2122)

Nixon

2024-10-09 5dbe6898cac191d12c487772d7336ab2b2a9c350

 examples/industrial_data_pretraining/lcbnet/demo.sh

@@ -44,6 +44,7 @@
        ++input=[${_logdir}/wav.${JOB}.scp,${_logdir}/ocr.${JOB}.txt] \
        +data_type='["kaldi_ark", "text"]' \
        ++tokenizer_conf.bpemodel=${file_dir}/bpe.pt \
        ++normalize_conf.stats_file=${file_dir}/am.mvn \
        ++output_dir="${inference_dir}/${JOB}" \
        ++device="${inference_device}" \
        ++ncpu=1 \