message: Fix Notifications settings view when threepids is undefined
diff: @@ -480,7 +480,7 @@ export default class Notifications extends React.PureComponent<IProps, IState> {
  return masterSwitch;
  }
  - const emailSwitches = this.state.threepids.filter(t => t.medium === ThreepidMedium.Email)
  + const emailSwitches = (this.state.threepids || []).filter(t => t.medium === ThreepidMedium.Email)
  .map(e => <LabelledToggleSwitch
  key={e.address}
  value={this.state.pushers.some(p => p.kind === "email" && p.pushkey === e.address)}
  