fix: return null for anify provider if filtered episodes returning nothing

src/controllers/episodes/getByAniListId/anify.ts

@@ -73,6 +73,9 @@ export async function getEpisodesFromAnify(
     })
     .sort(sortByProperty(sourcePriority, "providerId"));
 
+  if (filteredEpisodesData.length === 0) {
+    return null;
+  }
   const selectedEpisodeData = filteredEpisodesData[0];
   return {
     providerId: selectedEpisodeData.providerId,