Gracefully handle case if no material was found
Gracefully handle case if no material was found

CURA-2494

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