Update src/transformers/generation/utils.py

Co-authored-by: Joao Gante <[email protected]>

Author: jmamou

src/transformers/generation/utils.py

@@ -953,8 +953,7 @@ def _get_stopping_criteria(
         if generation_config._eos_token_tensor is not None:
             criteria.append(EosTokenCriteria(eos_token_id=generation_config._eos_token_tensor))
         if (
-            generation_config.is_assistant is not None
-            and generation_config.is_assistant
+            generation_config.is_assistant
             and generation_config.assistant_confidence_threshold is not None
             and generation_config.assistant_confidence_threshold > 0
         ):