XMPie Ucreate Qlingo Help

I am trying to use qlingo code for pulling an image from the asset folder, where the data field [customer number] is named the same as the .jpg file in the asset folder. This works fine, but the problem I have is that there is not a .jpg file for every customer number, and in that scenario, I need to pull in a blank .jpg. I created the blank asset, but need to know how to call it in when the folder does not contain customer number named asset. Clear as Mud :rolleyes:
Looking for coder advice, thanks