I've created a flow that fails when the SQL query returns an empty set. I've found lots of mentions of similar issues, but none that include a solution.
This is a very simple flow - I'm searching a database for employees with a given start date, and sending an email to each of them. Often, though, there are no employees with a particular start date, and the flow fails.

I've tried this:

And that doesn't work:

I found mentions of an "Empty" function, but when I try using that instead of "Null", I get this:

Any thoughts? Thanks in advance!