We encountered a few processing failures in the HSC S19A production around the edges of the field:
The problem occurs in deblendCoaddSources, and brings multibandDriver down.
The coadd image (tract=9812 patch=5,3 filter=NB0921) is completely NAN. In this case, the only contribution to the image is visit=67792 ccd=103.
Make this fail nicely.