Fix error in rendering an artist with empty bio

Includes a refactor for a helper to test for play count

lib/music_library_web/live/artist_live/show.ex

@@ -50,7 +50,14 @@ defmodule MusicLibraryWeb.ArtistLive.Show do
     }
   end
 
-  defp render_bio(nil), do: gettext("Biography not available")
+  defp bio_available?(artist_info_result) do
+    artist_info_result.ok? && artist_info_result.result && artist_info_result.result.bio !== ""
+  end
+
+  defp played?(artist_info_result) do
+    artist_info_result.ok? && artist_info_result.result &&
+      artist_info_result.result.play_count > 0
+  end
 
   # Bios start with text, then a link to read more on Last.fm, followed by a license text.
   # We split the bio at the read more link in order to render the license separately.