contourf needs testing with new quick2D

[ddkohler]

WrightTools/WrightTools/artists/_base.py

Lines 156 to 158 in 7a9c584

	if plot_type == "contourf":
	if "levels" not in kwargs.keys():
	kwargs["levels"] = np.linspace(kwargs["vmin"], kwargs["vmax"], 256)

when pixelated = False, this clause can run without "vmin" kwarg existing (per James)

[ddkohler]

I believe the fix is just changing kwargs["vmin"] and kwargs["vmax"] to vmin and vmax

We should make a test for this.

[ddkohler]

upon more inspection, it looks like this is one of the growing pains of our switch to using norm arguments around v3.5.1

using versions before this does not cause this error (James has verified)

I think these problem clauses need to screen for, and handle, norm in the kwargs, but it's clear testing should be incorporated to make the contourf/contour implementations robust.