fix empty asr result (#1765)

彭震东

2024-05-28 bd3b18016d573959a05d7af3f6d6f2f32ebdb728

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.