Fix error in plot_color2D method: handle lists of different-lengths lists in the y-axis
Fix error in plot_color2D method:
handle lists of different-lengths lists in the y-axis

QudevETH/PycQED_py3,DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3,DiCarloLab-Delft/PycQED_py3