Optimizing the exception logic

src/submission/check_validity.py

@@ -43,12 +43,14 @@ def is_model_on_hub(model_name: str, revision: str, token: str = None, trust_rem
             else:
                 tokenizer_class_candidate = config.tokenizer_class 
 
-
-            tokenizer_class = tokenizer_class_from_name(tokenizer_class_candidate)
+            if tokenizer_class_candidate:
+                tokenizer_class = tokenizer_class_from_name(tokenizer_class_candidate)
+            else:
+                tokenizer_class = None
             if tokenizer_class is None:
                 return (
                     False,
-                    f"uses {tokenizer_class_candidate}, which is not in a transformers release, therefore not supported at the moment.",
+                    f"uses '{tokenizer_class_candidate}' tokenizer class, which is not supported at the moment.",
                     None
                 )
         return True, None, config
@@ -61,7 +63,7 @@ def is_model_on_hub(model_name: str, revision: str, token: str = None, trust_rem
         )
 
     except Exception as e:
-        return False, f" error: {e}", None
+        return False, f" is not found on the hub (error: {e})", None
 
 
 def get_model_size(model_info: ModelInfo, precision: str):