Plotting fixes
Plotting fixes

Added protection for empty TGraph objects.

Changed max-scaling for objects with a maximum < 5 (e.g. efficiency plots).
Instead of increasing the maximum with sqrt(max), increase it with 20%.

Set minimum to 0. Required for some TGraph objects where all points were far
above 0. Might neet to revisit this if we get into trouble with SetLogy.

Made lumi and sqrt(s) optional for label drawing.

Made some font size adjustments.

spiiph/owls-hep,spiiph/owls-hep