Joshua Dengel

You could build a switch node where you check if there is a geometry with the line npoints(“”../object_merge3")> 0. Drag your dummy geo first into the imput and your object merge second. That means, you check if it has no geometry. If it doesn't and cannot perform a boolean, it does a boolean with the dummy instead.

There is a Video from Entagma at 3:11
https://www.youtube.com/watch?v=VX5S0c-V_jc [www.youtube.com]