default settings in draw() ignored if one of them is passed as argument

[maximelucas]

Running

H = xgi.random_hypergraph(10, ps=[0.6, 0.05, 0.001], seed=3)
settings = {"min_node_size": 5}
xgi.draw_nodes(H, settings=settings)

raises KeyError: 'node_fc_cmap' for settings["node_fc_cmap"].

This is because the function starts with

if settings is None:
        settings = {
            "min_node_size": 10.0,
            "max_node_size": 30.0,
            "min_node_lw": 1.0,
            "max_node_lw": 5.0,
            "node_fc_cmap": cm.Reds,
            "node_ec_cmap": cm.Greys,
        }

so that if you pass a settings argument with a single one of those (or that is just not None), all other default values are never defined.

I guess default settings should always be defined, and only updated by the arguments?

[maximelucas]

#441 solved this for drawing nodes. Still needs fixing for drawing hyperedges.

[maximelucas]

#456 fixed if for draw_hyperedges(). Still needs fixing for draw_dihypergraph().