message: Check for liveliness on submission when the server was previously dead
  Fixes
  Specifically the `return` at the end of the diff fixes the problem, but it seems worthwhile to check for liveliness when we know the server has been dead in previous attempts.
diff: @@ -145,9 +145,31 @@ module.exports = React.createClass({
  return this.state.busy || this.props.busy;
  },
  - onPasswordLogin: function(username, phoneCountry, phoneNumber, password) {
  + onPasswordLogin: async function(username, phoneCountry, phoneNumber, password) {
  + if (!this.state.serverIsAlive) {
  + this.setState({busy: true});
  + // Do a quick liveliness check on the URLs
  + try {
  + await AutoDiscoveryUtils.validateServerConfigWithStaticUrls(
  + this.props.serverConfig.hsUrl,
  + this.props.serverConfig.isUrl,
  + );
  + this.setState({serverIsAlive: true, errorText: ""});
  + } catch (e) {
  + this.setState({
  + busy: false,
  + ...AutoDiscoveryUtils.authComponentStateForError(e),
  + });
  + if (this.state.serverErrorIsFatal) {
  + return; // Server is dead - do not continue.
  + }
  + }
  +
  // Prevent people from submitting their password when something isn't right.
  - if (this.isBusy()) return;
  + if (!this.state.serverIsAlive) {
  + return;
  + }
  + }
  this.setState({
  busy: true,
  