Bug fixes to EncDec MT model
This pull request **introduces 1 alert** when merging 6b8bc699ec29a04c8be043eacebdfd0974c576e7 into 601b6789bcbfcd6721b9d27aee6008c9e44ba42f - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-c5dcb90b11d16b32e076d0ab25205640cc2cda01)

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Signed-off-by: Oleksii Kuchaiev <okuchaiev@nvidia.com>