fix actionHookDelay feature is not working properly if there is no de… (#679)

* fix actionHookDelayAction when no actions is defnied

* terminated by jambonz for giveuptimeout

lib/session/confirm-call-session.js

@@ -34,6 +34,9 @@ class ConfirmCallSession extends CallSession {
   _callerHungup() {
   }
 
+  _jambonzHangup() {
+  }
+
 
 }