check middleware var is set in PMIxUnit plugin

open-mpi / mtt

MPI Testing Tool

https://open-mpi.github.io/mtt

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check middleware var is set in PMIxUnit plugin #901

Closed dsikich closed 4 years ago

dsikich commented 4 years ago

PMIxUnit was assuming the midlog variable would always be set, but that is not the case when the pmix unit tests are being run against a system install of PMIx.