message: Unset group_id when it is 0
diff: @@ -62,8 +62,8 @@ class NewChannelForm extends Component {
  this.setState({ visibility });
  handleAuthor = (group_id) => {
  - if (group_id === 0) {
  - this.setState({ authorType: 'USER' });
  + if (group_id === '0') {
  + this.setState({ authorType: 'USER', group_id: null });
  return;
  }
  this.setState({ group_id, authorType: 'GROUP' });
  