Do not exp() None

Author: Enkidu93

machine/translation/huggingface/hugging_face_nmt_engine.py

@@ -164,7 +164,9 @@ def _try_translate_n_batch(
                 builder = TranslationResultBuilder(input_tokens)
                 for token, score in zip(output["translation_tokens"], output["token_scores"]):
                     builder.append_token(token, TranslationSources.NMT, exp(score))
-                builder.set_sequence_confidence(exp(output["sequence_score"]))
+                builder.set_sequence_confidence(
+                    exp(output["sequence_score"]) if output["sequence_score"] is not None else -1
+                )
                 word_pairs: Optional[Collection[Union[AlignedWordPair, Tuple[int, int]]]] = None
                 if output.get("token_attentions") is not None:
                     src_indices = torch.argmax(output["token_attentions"], dim=1).tolist()