mpi: fix migration check with rank 0 #860
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turns out that #827 uncovered a bug in our migration code.
in summary, when migrating ranks to a completely new host the check for an existing world from rank 0 would fail, triggering a new world "creation".
my bet is that the test slurp included in #827 worked was because we migrated other ranks before rank 0. the error appeared with larger core counts.