[RF] Consistent treatment of empty datasets with new CPU backend #14817
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As we discovered in a CMSSW ROOT
master
sync PR, the new RooFit CPUbackend treats empty datasets differently from the legacy NLL evaluation
backend:
cms-sw/cmsdist#9025
This commit is fixing this, in particular removing the assumption that
datasets used for fits with the new CPU backend are never empty.
A unit test that validates the behavior for empty data objects is also
added.
I set the priority to "high" because this is a blocker for CMSSW to use ROOT master.