App gives no feedback when connection to databox is lost

[cgreenhalgh]

(Databox 0.5.2 / Android app 0.5.7)
If the app loses contact with the databox, e.g. phone moves to another network (or databox is off), then it will typically show a view without dynamic content (e.g. no icons on the home "Databox Dashboard" view) but with no explicit indication that it has lost contact with the databox.