Merge pull request #328 from alibaba-damo-academy/dev_cmz2

zhifu gao

2023-04-07 0cc7af2c894a31f1b6d95d8af7e4efa414e2a11b

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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";
}
}