[fix] better solution for handling empty result (#1796)

Xingchen Song(宋星辰)

2024-06-11 0bd1a4d6a9893e45438505514a063d9deee91f21

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)