fix asr result is empty and punc error

lzr265946

2023-01-18 ad873c50eed0d97dd3fe3c7f13a5dea9dc4c5369

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)