Show a message to the user when the connection with the printer is lost
Show a message to the user when the connection with the printer is lost

CURA-1851

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