The WFIRST imager class fails for the fallback code for the no-pysynphot case. Looks like something minor in terms of the filter file setup or header, hopefully easy to fix.
I'm going to make it xf…
This issue is for the continued discussion of what @AlexGKim and @rcthomas brought up recently: that the Model classes could be made more general if not so much functionality were contained in them. S…