bug fix for empty text

shixian.shi

2024-02-27 9844be44e9e08576d3f7bbebfaf3a4878e363c7e

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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)