Listpicker =blank

What is the problem? Where is the error when I want to save the file? If it is empty list picker, stop. Do not save the file. It skips the message and the file is saved

Elements is a list, so if it is cast to a string for comparison it would be represented either as "[]" or "()", which is not equal to "". Instead, use the is list empty? block to check for whether the list is empty proceed accordingly.

There are two errors in your code Omar.

  1. Need to inquire the length of the List
  2. Notifier After Text Input does not apply

Notify List Status

Alternatively:
Notify List Status2