Multi-View Calendar API Issues

[ddincheva]

Description

• igniteui-angular version: 8.2.x

• When we have calendar with 2 or more month views and there are selected dates in all of them, deselectData() method called with no params should clear all selected dates, not only in the fist month view.

• If set monthsViewNumber property to a value smaller than 0 the calendar is layout is broken. Should not be allowed to be passed value lower than 0;
  

• If the calendar selection is single and try to call method selectdate([new Date(‘2019-05-04’)]) with passed array as parameter unhandled exception is thrown;

• Can’t clear selected date when a click on it or press Enter. Open calendar sample. Click on 11 September and on 15 November. Then click on 22 September and click again or press enter. The date should be deselected. - this will require more effort, so logged a new issue - Can’t clear selected date in calendar when clicking on it or pressing Enter. #5869