`relentless.simulate.InitializeRandomly` fails to raise "Failed to randomly pack this box" error in MPI

[clpetix]

relentless.simulate.InitializeRandomly fails to raise "Failed to randomly pack this box" error in MPI. The error does not cause the simulation to exit, rather it appears to be running.

[mphoward]

I think this is the same issue as #221 , see there for discussion.