Pie Menu simple script condition I've been using Pie Menu Editor and I'd like to create one that activates only in object mode when nothing is selected. I did a lot of research but since I have no background in coding it makes it very hard for me. 

The idea is to have one pie menu to create meshes when nothing is selected and another one with the same shortcut to merge two meshes together for instance.

It seems like it has to do with poll options. An example they give for instance if you want to create a pie menu that activates only while in edge mode you have to write :
return C.scene.tool_settings.mesh_select_mode[1]

Thank you for your help :)
I found a way !!! 

return len(bpy.context.selected_objects) == 0


This works just fine :)