Merge pull request #591 from alibaba-damo-academy/dev_lhn

hnluo

2023-06-05 594b79f59e7eefa6955c729f6264c8c99d1d9571

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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";
}
}