fix the issue of hotwords_embedding potentially being a null pointer

雾聪

2023-11-16 74cf8b65b2254eee059f6f599bb6095db5c66001

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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
 
int fstunion_main(int argc, char **argv);
 
int main(int argc, char **argv) { return fstunion_main(argc, argv); }