Added pre-read check for 3mf Reader
Added pre-read check for 3mf Reader

CURA-1263

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