Two issues with beam setup

[Juergen Reuter]

Two things from the old lhapdf.sin test are not working, the first one maybe correctly so:

process foo = u:d:c, U:D:C => e1, E1
sqrts = <number>
integrate (foo)

i.e. a process with particle lists in the initial state is not working in WHIZARD 2. Empty state matrix, triggering a bug. In 2.1.1 one representative was taken, and the process evaluated (my guess), but maybe this case without beam specification should fail with a distinct message!? Opinions?

Second issue: Not sure that this case works with the recent setup:

beams = p, A => lhapdf, lhapdf
 
integrate (lhapdf_drell_yan) {  $lhapdf_file = "cteq5l.LHgrid" 
   $lhapdf_file = "GSG961.LHgrid" }

i.e. specifying a proton and a photon PDF. This is important and should also work with the new setup of shallow bindings.

[Juergen Reuter]

@1: we will veto this.

@2: two different SF tags: "lhapdf" and "lhapdf_photon"

[Juergen Reuter]

First part done in r4986.

[Juergen Reuter]

Second part done (incl. non-unit tests) in r4988. Closing.