Add more empty domain tests to MdrunMpiTests
Catches the problem in !2523 (merged).
When run manually with GMX_ENABLE_DIRECT_GPU_COMM=1 and -ntmpi 4, catches the problem in #4400 (closed).
Fixes #4401 (closed)
Edited by Andrey Alekseenko
Catches the problem in !2523 (merged).
When run manually with GMX_ENABLE_DIRECT_GPU_COMM=1 and -ntmpi 4, catches the problem in #4400 (closed).
Fixes #4401 (closed)