Update asr_inference_paraformer_streaming.py

hnluo

2023-04-27 c5992ca03ea6d6c7b78e5c1d481a612d0f91ac21

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#include "yaml-cpp/null.h"
 
namespace YAML {
_Null Null;
 
bool IsNullString(const std::string& str) {
  return str.empty() || str == "~" || str == "null" || str == "Null" ||
         str == "NULL";
}
}