Query a list and collect list information if no attachment exists

Good afternoon,


I have a list that collects employee information as well as sends them a document for signature. Once the document is signed it is attached to the list item through a workflow.


I want to create a workflow to query the list each hour and send an email containing information on the list items which do not have an attached document. 


I thought this would be easy but configuring a query list action with a filter to only include if the attachment field is null (plus the regular for each, collection actions, build string action, etc.). I can't get this to work and I'm wondering if the query list filter where I look for items without an attachment is even possible.


All help is appreciated.



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