Fix exception if no directory for model is used
Fix exception if no directory for model is used

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