Refactor function to remove nested error handling

lib/music_library/artists.ex

@@ -46,29 +46,21 @@ defmodule MusicLibrary.Artists do
   end
 
   def fetch_artist_info(artist_id) do
-    case MusicBrainz.get_artist(artist_id) do
+    with {:ok, musicbrainz_artist} <- MusicBrainz.get_artist(artist_id) do
-      {:ok, musicbrainz_artist} ->
+      if discogs_id = MusicBrainz.Artist.get_discogs_id(musicbrainz_artist) do
-        if discogs_id = MusicBrainz.Artist.get_discogs_id(musicbrainz_artist) do
+        with {:ok, discogs_artist} <- Discogs.get_artist(discogs_id) do
-          case Discogs.get_artist(discogs_id) do
-            {:ok, discogs_artist} ->
-              create_artist_info(%{
-                id: musicbrainz_artist.id,
-                musicbrainz_data: musicbrainz_artist.musicbrainz_data,
-                discogs_data: discogs_artist
-              })
-
-            error ->
-              error
-          end
-        else
           create_artist_info(%{
             id: musicbrainz_artist.id,
-            musicbrainz_data: musicbrainz_artist.musicbrainz_data
+            musicbrainz_data: musicbrainz_artist.musicbrainz_data,
+            discogs_data: discogs_artist
           })
         end
-
+      else
-      error ->
+        create_artist_info(%{
-        error
+          id: musicbrainz_artist.id,
+          musicbrainz_data: musicbrainz_artist.musicbrainz_data
+        })
+      end
     end
   end