A spinner should be renderer always while waiting requested data to arrive
Some views render empty gray area
1. Open reittiopas and click a route to enter the route page
2. Switch tabs on the route page. No spinner.
3. Click a stop of the stop list of the route to move to the stop view. No spinner.
4. Click a route on a stop view to move back to the route view. No spinner.
Route page tabs do not render a spinner while loading data.
Transition from route page to stop page does not render a spinner