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) {

test/discovery-anilist.test.js

@@ -75,6 +75,13 @@ test('requests refuse redirects', async () => {
   await assert.rejects(clientFor(redirected).title(1), e => e instanceof AniListSkip && e.reason === 'upstream');
 });
 
+test('recs drops recommendations whose media was removed', async () => {
+  const recs = fixture('recs');
+  recs.data.Media.recommendations.nodes = [recs.data.Media.recommendations.nodes[0], { rating: 10, mediaRecommendation: null }];
+  const out = await clientFor(() => json(recs)).recs(101);
+  assert.deepEqual(out.map(e => e.anilistId), [201]);
+});
+
 test('one malformed item invalidates a list response', async () => {
   const invalid = e => e instanceof AniListSkip && e.reason === 'invalid';
   const recs = fixture('recs');