Thanks Jason - I thought there was one like that, but had misplaced it as I hadn't reinstalled the mySQLi extension after issues with the Extension Manager. (Although it might be somewhere else, pre mySQLi?)
So I have that reinstalled, and trying:
WA > mySQLi > Show Region > mySQLi Show If Recordset Is Empty / mySQLi Show If Recordset Is Not Empty
But I'm getting the error:
Before you using this server behavior, please create a recordset.
Even though the page does have recordsets. Copy attached below.