"SD printing byte 0/0" means we ain't printing
"SD printing byte 0/0" means we ain't printing

Newer versions of Marlin apparently now report it like that instead of
returning "Not SD printing".

Jaesin/OctoPrint,foosel/OctoPrint,foosel/OctoPrint,foosel/OctoPrint,Jaesin/OctoPrint,Jaesin/OctoPrint,foosel/OctoPrint,Jaesin/OctoPrint