lastfm bio fetch to fallback to english if not found in user locale

airsonic-main/src/main/java/org/airsonic/player/service/LastFmService.java

@@ -244,7 +244,23 @@ public class LastFmService {
             if (info == null) {
                 return null;
             }
-            return new ArtistBio(processWikiText(info.getWikiSummary()),
+
+            String wiki = info.getWikiSummary().trim();
+            boolean isEnglish = locale.getLanguage().equals(Locale.ENGLISH.getLanguage());
+            // try to detect empty bio
+            if (!isEnglish && (wiki.length() < 250 &&
+                    wiki.startsWith("<a href=\"https://www.last.fm/music/") && wiki.endsWith("on Last.fm</a>"))
+            ) {
+                LOG.debug("Got empty bio for " + artistName + ", retry English");
+                Artist info1 = Artist.getInfo(artistName, Locale.ENGLISH, null /* username */, LAST_FM_KEY);
+                if (info1 != null) {
+                    // ensure we do not replace non-null with null & NPE...
+                    info = info1;
+                    wiki = info.getWikiSummary().trim();
+                }
+            }
+
+            return new ArtistBio(processWikiText(wiki),
                                  info.getMbid(),
                                  info.getUrl(),
                                  info.getImageURL(ImageSize.MEDIUM),