Don't forget MPI_Finalize() if !QUESO_HAVE_HDF5
Don't forget MPI_Finalize() if !QUESO_HAVE_HDF5

Otherwise MPI returns 1 and run_all.sh thinks we have an actual error
rather than just a disabled example.

briadam/queso,briadam/queso,briadam/queso,briadam/queso,briadam/queso