Add a catch for old fits where setupfit didn't generate cuts correctly

Created by: scarlehoff

In the new code we are asking explicitly for cuts where cuts are needed. In the olden times vp-setupfit would just skip some datasets if there were no cuts for them so there are some fits in the server that, in order to work, need the filters to be regenerated.

I'll have a look at how add a flag so that if fromfit is being used and no cut is found the default is to not cut anything.

This is a problem we saw already at some point in the past, opening the issue so I don't forget (or in case people prefer the exception to be triggered and fixed in a case-by-case basis).