Eleven: Fix menu for first item and properly show empty view

* Currently, the three dots on the first song in a playlist do nothing
  -> Remove the special case for position=0
* When the menu works and you use it to remove the last (first position)
  item from the playlist, the "empty view" won't get shown
  -> set visible explicitly, now it looks like when you first show
     an empty playlist

Change-Id: I2fa4a84cff27fe6fba1c8ea66b7381cc9457d434