[Rivet] Rivet crash when applying projection

[Hendrik Hoeth]

Thus spake Hendrik Hoeth (hendrik.hoeth at cern.ch):

> Hi Frank,
> 
> Thus spake Frank Siegert (frank.siegert at durham.ac.uk):
> 
> > Then I have generated HepMC events with Sherpa as attached and tried
> > to run them through rivet
> > 
> >   rivet -a D0_2008_S7554427 file.hepmc2g
> 
> I can reproduce the segfault with your HepMC events and your command on
> the Wuppertal cluster, so we seem to talk about the same bug.

Having installed gdb on the machine in Wuppertal, I can also see that
your and my case both crash in InvMassFinalState.

-- 
"Two equal numbers are equivalent, even if they come from two
 different people one of which you don't like"
(MLM about the theoretical top cross-section, in a meeting
about theoretical uncertainties on the top mass)