Extend Found Set with blank dates

[K1200]

I have a script the finds records within a user-specified pair of dates. Now I want to Extend Found Set to include any records for which the date field is blank -- but the Edit Find Request won't accept "" for the date field. It says it must be a valid date.

What is the proper way to designate a blank date field in a Find or Extend script step?

Thanks in advance for any assistance.

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I believe that should get into Guinness as the shortest post ever. :)