Merge branch '576-empty-state-messages-are-briefly-shown-when-they-shouldn-t' into 'master'

Prevent empty state messages from showing briefly

When we clear a list in `onPause()`, the proper behavior is that the empty state
message is shown, because the list is indeed empty.

However, we will reload the list content again in `onResume()`,
so the fix chosen in this MR is to force showing the progress bar
right after clearing the list.

Closes #576

See merge request !267