Discovery AniList client: drop removed recommendations (BL-0051)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

discovery/anilist.js

@@ -136,7 +136,9 @@ function createClient({ endpoint = process.env.DISCOVERY_ANILIST_URL || 'https:/
     },
     async recs(id) {
       const nodes = mediaOf(await post(QUERIES.recs, { id })).recommendations?.nodes;
-      return entries(nodes, node => node.mediaRecommendation).filter(({ item }) => item.rating > 0)
+      // AniList returns a null mediaRecommendation when the recommended media was removed: valid, just drop it.
+      const present = need(nodes).filter(node => !isObject(node) || node.mediaRecommendation !== null);
+      return entries(present, node => node.mediaRecommendation).filter(({ item }) => item.rating > 0)
         .map(({ item, record }) => ({ anilistId: record.anilistId, rating: item.rating, record }));
     },
     async creator(staffId) {