message: add validation when clicking Ok in dialog
diff: @@ -72,7 +72,31 @@ export default createReactClass({
  },
  onOk: async function() {
  + const activeElement = document.activeElement;
  + if (activeElement) {
  + activeElement.blur();
  + }
  + await this._nameFieldRef.validate({allowEmpty: false});
  + if (this._aliasFieldRef) {
  + await this._aliasFieldRef.validate({allowEmpty: false});
  + }
  + // Validation and state updates are async, so we need to wait for them to complete
  + // first. Queue a `setState` callback and wait for it to resolve.
  + await new Promise(resolve => this.setState({}, resolve));
  + if (this.state.nameIsValid && (!this._aliasFieldRef || this._aliasFieldRef.isValid)) {
  this.props.onFinished(true, this._roomCreateOptions());
  + } else {
  + let field;
  + if (!this.state.nameIsValid) {
  + field = this._nameFieldRef;
  + } else if (this._aliasFieldRef && !this._aliasFieldRef.isValid) {
  + field = this._aliasFieldRef;
  + }
  + if (field) {
  + field.focus();
  + field.validate({ allowEmpty: false, focused: true });
  + }
  + }
  },
  onCancel: function() {
  