Merge pull request #830 from alibaba-damo-academy/dev_ts

Xian Shi

2023-08-10 e2b3edec45fe1bfd76493acc366df971e89e7ae2

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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";
}
}