add message if buffer is null

雾聪

2023-08-24 0b692f69b5c8b6a43765cc6e98d3a259a1fc86f9

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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.