Add check in zoom to layer function to see if no data in layer.
update map.zoom channels for internal pubsub tester
update zoomToLayer, to check OL for layer existence and non-null OL extent
update internal pubsub tester sample payload for map.zoom.toLocation
Merge pull request #181 from ozone-development/bug/178/zoom-to-empty-layer

Bug/178/zoom to empty layer