Add logging for server subscriptions in ServerMessageService

frontend/src/app/pages/altitude/chat/components/user-list/user-list.component.ts

@@ -18,7 +18,9 @@ export class UserListComponent {
 
   protected readonly serverState = computed(() => {
     const state = this.chatService.serverState();
-    if (!state) return null;
+    if (!state) {
+      return null;
+    }
 
     return {
       servers: [...state.servers]