Null list to empty list on index

Hi everyone,
I have a problem. I dont know how to replace nulls to index in code block. I want all nulls to replace them with “$$”. Can someone help me? I know how to repalce Empty List but don’t know how it works with nulls.
That is in my task:

Thank you in advance.

Hi krzysiektoja,
a short search in the forum let to this topic:

Should do the trick?

Greetings

1 Like

You could try replace nulls from Clockwork and think crumple have one as well

Thanks, have a nice day