code: protected function makeStatusForPotentiallyNonExistent($errorCatNode)
      {
          if ($errorCatNode instanceof \DOMNode) {
              $status = $this->makeStatusFromErrorQualifier($errorCatNode->nodeValue);
          } else {
              $status = Result::STATUS_ERROR;
          }
  
          return $status;
      }
docs: Make status from a category DOMNode or default status.
  
  @param \DOMNode|null $errorCatNode
  @return string