[fix] webui: empty address for instance if unknown raft_id

src/http_server.rs

@@ -314,7 +314,7 @@ fn get_replicasets_info(
     let mut res: HashMap<ReplicasetId, ReplicasetInfo> = HashMap::with_capacity(replicasets.len());
 
     for instance in instances {
-        let address = addresses.get(&instance.raft_id).cloned().unwrap();
+        let address = addresses.get(&instance.raft_id).cloned().unwrap_or(String::new());
         let replicaset_id = instance.replicaset_id;
         let replicaset = replicasets.get(&replicaset_id).unwrap();
         let mut http_address = String::new();