fix decoding_ind none bug

haoneng.lhn

2023-09-12 eed5cbb9457f0842d9ea8f41cd88459a5dbc9e70

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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.