message: filter out composed mappers without propTypes
diff: @@ -28,7 +28,7 @@ export function createResponsiveMapper(props, getter = classPattern, propTypes =
  export function composeWithPropTypes(...funcs) {
  const composed = compose(...funcs)
  - composed.propTypes = [...funcs].reduce((acc, {propTypes}) => ({...acc, ...propTypes}), {})
  + composed.propTypes = [...funcs].filter(f => f.propTypes).reduce((acc, {propTypes}) => ({...acc, ...propTypes}), {})
  return composed
  }
  