nip77: only fetch ids after sync if there are ids to fetch.

nip77/nip77.go

@@ -161,7 +161,9 @@ func SyncEventsFromIDs(ctx context.Context, dir Direction) {
 		}
 	}
 
+	if len(batch) > 0 {
 		for evt := range dir.From.QueryEvents(nostr.Filter{IDs: batch}) {
 			dir.To.Publish(ctx, evt)
 		}
 	}
+}