Empty assert hunt (#6056)

* Fixed empty asserts

* black-reformatted stragglers in templates

* More code quality checks

* Update src/transformers/convert_marian_to_pytorch.py

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Update src/transformers/convert_marian_to_pytorch.py

Co-authored-by: Sam Shleifer <sshleifer@gmail.com>

* removed unused line as per @sshleifer

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sam Shleifer <sshleifer@gmail.com>

src/transformers/tokenization_utils_base.py

@@ -683,7 +683,8 @@ class SpecialTokensMixin:
         for key, value in kwargs.items():
             if key in self.SPECIAL_TOKENS_ATTRIBUTES:
                 if key == "additional_special_tokens":
-                    assert isinstance(value, (list, tuple)) and all(isinstance(t, str) for t in value)
+                    assert isinstance(value, (list, tuple)), f"Value {value} is not a list or tuple"
+                    assert all(isinstance(t, str) for t in value), "One of the tokens is not a string"
                     setattr(self, key, value)
                 elif isinstance(value, (str, AddedToken)):
                     setattr(self, key, value)
@@ -752,7 +753,7 @@ class SpecialTokensMixin:
 
         added_tokens = 0
         for key, value in special_tokens_dict.items():
-            assert key in self.SPECIAL_TOKENS_ATTRIBUTES
+            assert key in self.SPECIAL_TOKENS_ATTRIBUTES, f"Key {key} is not a special token"
 
             if self.verbose:
                 logger.info("Assigning %s to the %s key of the tokenizer", value, key)