message: Monitoring: Guard against undefined Monitoring data in Redux
  These helper functions are supposed to always return an object, even if
  the data in Redux has been set to null or undefined.
diff: @@ -65,8 +65,8 @@ const alertDescription = alert => {
  export const silenceState = s => _.get(s, 'status.state');
  -const alertsToProps = ({UI}) => UI.getIn(['monitoring', 'alerts'], {});
  -const silencesToProps = ({UI}) => UI.getIn(['monitoring', 'silences'], {});
  +const alertsToProps = ({UI}) => UI.getIn(['monitoring', 'alerts']) || {};
  +const silencesToProps = ({UI}) => UI.getIn(['monitoring', 'silences']) || {};
  const pollers = {};
  const pollerTimeouts = {};
  