Only show changelog if we have a global container stack
Only show changelog if we have a global container stack

If we have no global stack we can assume this is a "first run"
situation.

Contributes to CURA-2519

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