Syntax to check when %todolist is empty

[KL]

I have a loop back action to a group stage.  The loop back is set to "remove from todolist when action taken".  Intent is to have all members on todolist take action and then move folder to next stage.  I thought I would try to use conditional action "if todolist is empty()", to start action to move to next stage.  What is the syntax to use to evaluate the todolist?

[NAH · Accepted solution]

I use:

((%Length(%ToDoList(%FolderID))= 0))

In the Only Start Action If property of a Timed Action with the timer set to 1 minute after When Folder was last updated.  Using a timed action rather than a conditional ensures that the test is not fired before the AlerManager has had time to update the To Do List.