add check for non-exist object

Author: wty-Bryant

service/internal/checksum/middleware_validate_output.go

@@ -94,7 +94,7 @@ func (m *validateOutputPayloadChecksum) HandleDeserialize(
 
 	// Skip validation if no checksum algorithm or checksum is available.
 	if len(expectedChecksum) == 0 || len(algorithmToUse) == 0 {
-		if response.Body != http.NoBody && m.LogValidationSkipped {
+		if response.StatusCode != 404 && response.Body != http.NoBody && m.LogValidationSkipped {
 			// TODO this probably should have more information about the
 			// operation output that won't be validated.
 			logger.Logf(logging.Warn,