Merge pull request #492 from alibaba-damo-academy/dev_smohan

yhliang

2023-05-11 d2dc3af1a69ee4075bcfc0c83dc0fb8e3fc1db4e

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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";
}
}