Fix: avoid crashing when Nuntium Token is missing

This is a hotfix attempt for #2377

Author: matiasgarciaisaia

lib/ask/runtime/nuntium_channel.ex

@@ -467,6 +467,8 @@ defmodule Ask.Runtime.NuntiumChannel do
       end
     end
 
+    def message_inactive?(_, _), do: false
+
     def has_delivery_confirmation?(_), do: true
     def has_queued_message?(_, _), do: false
     def message_expired?(_, _), do: false