[Rivet] WFinder on VetoedFinalState

[Ulrike Schnoor]

Dear Rivet experts,

trying to upgrade a private rivet analysis to RIVET 1.6.0, I stumbled
accross the following change with respect to the previous version:
It used to be possible to define a WFinder with a vetoed final state
as input with a constructor like this:
WFinder::WFinder(const FinalState& fs,
                   PdgId pid,
                   double m2_min, double m2_max,
                   double dRmax)
Am I missing something, or why is this function not available in RIVET
1.6.0? What can I do as an alternative? I need to find two Ws which
can both decay into leptons of the same flavor, so when one W is
reconstructed, I have to somehow veto it for the next WFinder.

Thanks,
Ulrike