Ultranest failing

The ultranest sampler appears to be tripping up the tests. Does anyone have experience with it and able to fix?

cc @moritz.huebner @matthew-pitkin (I can't recall who implemented it)

mentioned in commit matthew-pitkin/bilby@584369cb

mentioned in merge request !906 (merged)

I've hopefully fixed this in !906 (merged)

closed with merge request !906 (merged)

mentioned in commit 9092f0f2