Instead of having to add two filters for the same field in a smart list in order to find specific values or no value, it would be great just to be able to just use one filter and add NULL (or something simliar) to the selected value list.
For example, if you want a smart list of leads who have a score of zero or the score field is empty, instead of creating a smart list such as (Lead Score is 0 OR Lead Score is empty), you would just use one filter and add NULL as a value (Lead Score is 0, NULL).
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