Add albumtypes list field in Discogs plugin

and derive single field albumtype from it. FIXME this reverts to a solution
before get_media_and_albumtype helper was introduced.

beetsplug/discogs.py

@@ -434,9 +434,12 @@ def get_album_info(self, result):
 
         # Extract information for the optional AlbumInfo fields that are
         # contained on nested discogs fields.
-        media, albumtype = self.get_media_and_albumtype(
-            result.data.get("formats")
-        )
+        albumtypes = albumtype = media = label = catalogno = labelid = None
+        if result.data.get("formats"):
+            albumtypes = result.data["formats"][0].get("descriptions", [])
+            if len(albumtypes) > 0:
+                albumtype = albumtypes[0]
+            media = result.data["formats"][0]["name"]
 
         label = catalogno = labelid = None
         if result.data.get("labels"):
@@ -478,6 +481,7 @@ def get_album_info(self, result):
             artist=artist,
             artist_id=artist_id,
             tracks=tracks,
+            albumtypes=albumtypes,
             albumtype=albumtype,
             va=va,
             year=year,