fix: musicbrainz error if a release has no label

moe/plugins/musicbrainz/mb_core.py

@@ -384,12 +384,17 @@ def _create_album(release: dict) -> Album:
     """Creates an album from a given musicbrainz release."""
     log.debug(f"Creating album from musicbrainz release. [release={release['id']!r}]")
 
+    if release["label-info-list"]:
+        label = release["label-info-list"][0]["label"]["name"]
+    else:
+        label = None
+
     album = Album(
         artist=_flatten_artist_credit(release["artist-credit"]),
         country=release.get("country"),
         date=_parse_date(release["date"]),
         disc_total=int(release["medium-count"]),
-        label=release["label-info-list"][0]["label"]["name"],
+        label=label,
         mb_album_id=release["id"],
         media=release["medium-list"][0]["format"],
         original_date=_parse_date(release["release-group"]["first-release-date"]),

tests/plugins/musicbrainz/test_mb_core.py

@@ -423,6 +423,15 @@ def test_no_country(self, mock_mb_by_id, mb_config):
 
         moe_mb.get_album_by_id(mb_album_id)
 
+    def test_no_label(self, mock_mb_by_id, mb_config):
+        """Don't error if no label in the release."""
+        mb_album_id = "112dec42-65f2-3bde-8d7d-26deddde10b2"
+        release = copy.deepcopy(mb_rsrc.full_release.release)
+        release["release"]["label-info-list"].clear()
+        mock_mb_by_id.return_value = release
+
+        moe_mb.get_album_by_id(mb_album_id)
+
 
 class TestGetTrackByID:
     """Test `get_track_by_id`."""