support multiple sessions in recent activity (#332)
support multiple sessions in recent activity (#332)

* support multiple sessions in recent activity

* ensure values always defined

* pass contact to cleanUpCalls

ringcentral/ringcentral-js-widget,u9520107/ringcentral-js-widget,u9520107/ringcentral-js-widget,ringcentral/ringcentral-js-widget,u9520107/ringcentral-js-widget,ringcentral/ringcentral-js-widget