fix: crash when using online mode with uninitialized jieba (#2663)

Gang Zhuo

2025-09-20 6244b743a70f8ac152e6b8f517669671322da0a8

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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.