[Rivet] Rivet crash when applying projection

[Hendrik Hoeth]

Thus spake Frank Siegert (frank.siegert at durham.ac.uk):

> When I started putting in some output, this thing is becoming even
> more weird and indeterministic. Are you already back in Durham today,
> so that we can look at it together?

I'm still in Germany and will be back on Monday.

-- 
"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)