viz: node_fc_cmap does not work if node_fc is not a NodeStat

[maximelucas]

Let's say we plot a simple hypergraph

edges = [[1, 2], [1, 2, 3], [2, 3], [3, 4, 5, 6]]
H = xgi.Hypergraph(edges)

# plot node size ~ degree, with shades of green
xgi.draw(H, node_fc=H.nodes.degree, node_fc_cmap=mpl.colormaps["Greens"])

Here H.nodes.degree is a NodeStat, it works:

But if we replace it by a list with the same values H.nodes.degree.aslist(), the cmap is discarded and back to its default:

I guess we may have a similar problem with related variables: node_ec_cmap, dyad_color_cmap, edge_fc_cmap.

[nwlandry]

PR #402 fixes this, but I need to figure out why it breaks the unit tests for drawing. It passes the tests for the _color_arg_to_dict just fine, but for some reason it isn't getting the number of patches correct. I did verify that the visualization looks correct.

[nwlandry]

Any ideas, @thomasrobiglio or @maximelucas?

[thomasrobiglio]

see #402 (comment)