Removed definitions from empty instance containers
Removed definitions from empty instance containers

This caused empty profiles to pop up in dropdown. Issue is now fixed in
_emptyInstanceContainer where it should be fixed

CURA-1913

senttech/Cura,senttech/Cura,hmflash/Cura,hmflash/Cura,fieldOfView/Cura,totalretribution/Cura,fieldOfView/Cura,ynotstartups/Wanhao,ynotstartups/Wanhao,Curahelper/Cura,Curahelper/Cura,totalretribution/Cura