Properly handle place removals

* Transition to OSM route or index instead of staying on ghost route/ID
  (closes sidebar if it was a custom place)
* Ensure save button and lists are in the correct state

tests/acceptance/navigation-test.js

@@ -42,6 +42,9 @@ class MockStorageService extends Service {
   findPlaceById() {
     return null;
   }
+  isPlaceSaved() {
+    return false;
+  }
   loadPlacesInBounds() {
     return [];
   }