message: Fix soft crash on soft logout page
  This fixes a soft crash on the soft logout page, which can occur if it is shown
  very quickly after app startup before encryption has become enabled.
diff: @@ -72,10 +72,13 @@ export default class SoftLogout extends React.Component {
  this._initLogin();
  - MatrixClientPeg.get().countSessionsNeedingBackup().then(remaining => {
  + const cli = MatrixClientPeg.get();
  + if (cli.isCryptoEnabled()) {
  + cli.countSessionsNeedingBackup().then(remaining => {
  this.setState({ keyBackupNeeded: remaining > 0 });
  });
  }
  + }
  onClearAll = () => {
  const ConfirmWipeDeviceDialog = sdk.getComponent('dialogs.ConfirmWipeDeviceDialog');
  