Fix two bugs for blank voice (empty speech): (#1403)

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

 runtime/onnxruntime/src/funasrruntime.cpp

@@ -245,7 +245,7 @@
            return p_result;
        }
      if(offline_stream->UseVad()){
         audio.Split(offline_stream);
         audio.CutSplit(offline_stream);
      }

      float* buff;