Based on the knowledge sources provided, there isn't specific information about filtering for empty lists in Mixpanel. The documentation covers list properties extensively, including how to filter by list values using "Any" and "All" operators, but doesn't explicitly mention how to filter for empty lists.
Mixpanel does have documentation about handling falsy values like "undefined", "null", and "empty string", which are parsed as (not set) or (empty string) in the UI, but empty lists are not specifically addressed in the provided materials.
When working with list properties in Mixpanel, the documentation shows that you can filter by specific values within lists, but doesn't provide a direct method for identifying empty lists (i.e., []).
If you're trying to identify events where a list property exists but contains no values, you might need to explore alternative approaches, such as:
1. Using JQL (JavaScript Query Language) for more complex filtering
2. Creating a custom property that indicates whether the list is empty
3. Contacting Mixpanel support for specific guidance on this use case
Since the knowledge sources don't contain specific information about filtering for empty lists, I recommend reaching out to Mixpanel support for the most accurate guidance on this specific scenario.
