fix: only send hints when it's not empty

server/src/game/sessionHandler.js

@@ -47,6 +47,7 @@ export default class SessionHandler {
         t.completed = true
       })
 
+    if (stage.hints && stage.hints.length > 0)
       this.session.hints.push(stage.hints)
 
     this.addNewTasks()
@@ -56,6 +57,7 @@ export default class SessionHandler {
       hints: stage.hints,
       callback: () => {
         pushToSession(this.session.id, 'tasks', this.session.tasks)
+        if (stage.hints && stage.hints.length > 0)
           pushToSession(this.session.id, 'hints', stage.hints)
         pushToSession(this.session.id, 'status', this.session.status)
       },