Add POP_SUB in td_write_mxll_field
Description
Add POP_SUB before exiting subroutine when the MPI group is not root. This was failing for MPI and was not caught by the buildbots because the feature is used in a long test.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.