- Clear groups service state on login and logout.
- Handle case where focus group is null when watching the focused group
and userid for changes. This can happen when clearGroups is called since
it sets the focus group to null which triggers a call to the watch
function. There are two watch function that get triggered; one in
sidebar-content, the other in the group service.
- Clear direct-linked id states on clearSelection and when a new
focusedGroup is selected.