- fix bug when using octoprint 1.4.0 with multiple extruders - fix autoscale if some temperatures contain NaN
- fix bug when using octoprint 1.4.0 with multiple extruders
- fix autoscale if some temperatures contain NaN

1r0b1n0/OctoPrint-Tempsgraph,1r0b1n0/OctoPrint-Tempsgraph,1r0b1n0/OctoPrint-Tempsgraph