Ok, so I am now wondering: is it possible in LABKEY.ext.Store to have the null/empty values replaced by something more meaningful, like "null" or "N/A" ?

Either on the server side (via a config or an SQL hack) or on the client side manipulating the store itself?

Because the way it is right now, if they're empty, then there is no way to select these rows via (Lov)ComboBox!

Thanks.