Matt Craig
Matt Craig
Punting to next version.
Note to self: check astropy main repo for this, I remember it coming up in the last couple of days...
So this has to do with masking, I think, since resetting the `ImageFileCollection` made this work again.
This could be done with the new `Valid` widget in ipywidgets.
This is partly addressed by 9f24850d3f3e33e0ac83f1bfd9aaf29028202fd6 which adds a count of the number fo groups to be processed to the progress bar.