message: fix onBlur breaking the SetEmail field (setting it back empty :()
diff: /*
  Copyright 2017 Vector Creations Ltd
  +Copyright 2018 New Vector Ltd
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  @@ -36,7 +37,7 @@ export default React.createClass({
  getInitialState: function() {
  return {
  - emailAddress: null,
  + emailAddress: '',
  emailBusy: false,
  };
  },
  @@ -127,6 +128,7 @@ export default React.createClass({
  const EditableText = sdk.getComponent('elements.EditableText');
  const emailInput = this.state.emailBusy ? <Spinner /> : <EditableText
  + initialValue={this.state.emailAddress}
  className="mx_SetEmailDialog_email_input"
  autoFocus="true"
  placeholder={_t("Email address")}
  