Smart Lists With No Filters Defined
Issue
You created a Smart List, but did not define the filters (example: "Member of Smart List" with no Smart List named) and are wondering if this will cause no leads to show up in the results.
Solution
If you create a Smart List and you do not define any filters, this will cause all leads in your database or leads visible in the partition and workspace to appear in your results.
This can create problem if you have nested Smart Lists. For example, if you have a Smart List with the filter "Member of Smart List = Lead not in" with Smart List A selected, and Smart List A has no filter, this logic will cause you exclude all leads in your database.