keep blank for english asr result (#623)

zhaomingwork

2023-06-13 4a33f08defa92ac6c9c757dbde06d29d183bf203

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#!/bin/bash
if [[ $OSTYPE == 'darwin'* ]]; then
  conda install -c conda-forge -y pynini=2.1.5
else
  pip install pynini==2.1.5
fi