message: fix week picker to support empty label on clear
diff: @@ -21,9 +21,16 @@ class CustomElements extends Component {
  this.setState({ selectedDate: date.clone().startOf('week') });
  }
  - formatWeekSelectLabel = (date, invalidLabel) => (date && date.isValid()
  - ? `Week of ${date.clone().startOf('week').format('MMM Do')}`
  - : invalidLabel)
  + formatWeekSelectLabel = (date, invalidLabel) => {
  + if (date === null) {
  + return '';
  + }
  +
  + return date && date.isValid() ?
  + `Week of ${date.clone().startOf('week').format('MMM Do')}`
  + :
  + invalidLabel;
  + }
  renderCustomDayForDateTime = (date, selectedDate, dayInCurrentMonth, dayComponent) => {
  const { classes } = this.props;
  