message: chore: improve the way to print to stderr
  print to stderr even if falsy value is thrown or thrown error does not have property `stack`. it was intended to implement by
diff: @@ -131,7 +131,7 @@ function _getDiagnostics(
  process.stdout.write(JSON.stringify(resultObject, null, 2));
  return GRAPHQL_SUCCESS_CODE;
  } catch (error) {
  - process.stderr.write(error.stack + '\n');
  + process.stderr.write((error?.stack ?? String(error)) + '\n');
  return GRAPHQL_FAILURE_CODE;
  }
  }
  @@ -145,7 +145,7 @@ function _getOutline(queryText: string): EXIT_CODE {
  throw Error('Error parsing or no outline tree found');
  }
  } catch (error) {
  - process.stderr.write(error.stack + '\n');
  + process.stderr.write((error?.stack ?? String(error)) + '\n');
  return GRAPHQL_FAILURE_CODE;
  }
  return GRAPHQL_SUCCESS_CODE;
  