Return false when 3D view is disabled or toolhead is not visible
Return false when 3D view is disabled or toolhead is not visible

cncjs/cncjs,cheton/cnc.js,cheton/cnc.js,cncjs/cncjs,cheton/piduino-grbl,cheton/cnc,cheton/cnc,cheton/cnc,cheton/cnc.js,cncjs/cncjs,cheton/piduino-grbl,cheton/piduino-grbl