There are some cases when I don’t want my bot to make any response. I added action_listen for such cases in the stories. After training it started to predict action_default_fallback instead of action_listen. I also tried not to write anything in those cases: I just deleted the action_listen-s. Still predicting action_default_fallback 
What’s the matter? Can’t action_listen be trained the way other actions are?
What other workarounds you can suggest?
P.S. Just for making sure my stories are ok, when I replace those action_listen-s by some other action, let’s say utter_something then after training it works fine. utter_something is being predicted normally.