bug fix for asr_launch empty speech (#709)

Xian Shi

2023-07-04 11daec8222410848c2302f11f664911bf8280374

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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.