Can someone give me an expression that actually works for when knowledge base doesnt give an answer? I have tried (turn.KnowledgeAgent.responded) which doesnt work. If there is an answer or isnt an answer it does the same thing. I have tried (workflow.KBexpanded.length === 0) which doesnt work when the knowledge base can't answer. I have tried the same with turn.KnowledgeAgent?.answer?.length === 0 and that doesn't work either