Small issue and probably, I am the only who runs into this, because I am calling isofit.utils.template_construction.Pathnames directly in EnPT:
#735 implemented a new skyview_factor in isofit 3.5.1. It is set to None by default in apply_oe (

) but in Pathnames, there is no default set ( ), i.e., simply updating isofit from 3.4.3 to 3.5.1 breaks the implementation in EnPT which does not yet set the skyview_factor when calling Pathnames.

Setting skyview_factor=None in Pathnames would fix it. However, all the other parameters of Pathnames are also implemented without defaults, so you I guess you need to decide if it makes sense to add them all there.