matplotlib and chainconsumer: `ValueError: posx and posy should be finite values`

If using matplotlib 2.1.0, then ChainConsumer may crash when trying to save the corner plots. This is a known issue see here and here.

Workarounds:

If you don't care about your matplotlib version

pip install matplotlib==2.0.2

If you do, then you'll have to do save=False in the plot_corner call which will return the figure then save it yourself.

I'm not sure there is a peyote fix for this (other than insisting on the version of matplotlib?), but I wanted to flag it to save others the headache.