avoid NPE when no search result displayer is obtained.
the search mediator is notified straight from our pong listener. The issue we have now, even creating a renewed task and getting a handle of the searchmanagerimpl is that once the onResult() event bubbles all the way up to the search mediator, it cannot find a searchresult displayer for that search token id, gotta see when it's being removed and avoid that from happening. Once I do that, i'll revert all the changes related to the DomainSwitching task as it doesn't seem necessary as cool as it was building it.