bug fix: MPI should only fail with unsupported threading mode if we actually run distributed
bug fix: MPI should only fail with unsupported threading mode if we actually run distributed

emjotde/amunn,emjotde/amunn,emjotde/amunn,marian-nmt/marian-train,marian-nmt/marian-train,emjotde/Marian,marian-nmt/marian-train,emjotde/amunmt,emjotde/Marian,marian-nmt/marian-train,emjotde/amunmt,marian-nmt/marian-train,emjotde/amunmt,emjotde/amunn,emjotde/amunmt