[Barthez Tokenizer] Fix saving (#15815)

src/transformers/models/barthez/tokenization_barthez.py

@@ -288,7 +288,11 @@ class BarthezTokenizer(PreTrainedTokenizer):
             save_directory, (filename_prefix + "-" if filename_prefix else "") + VOCAB_FILES_NAMES["vocab_file"]
         )
 
-        if os.path.abspath(self.vocab_file) != os.path.abspath(out_vocab_file):
+        if os.path.abspath(self.vocab_file) != os.path.abspath(out_vocab_file) and os.path.isfile(self.vocab_file):
             copyfile(self.vocab_file, out_vocab_file)
+        elif not os.path.isfile(self.vocab_file):
+            with open(out_vocab_file, "wb") as fi:
+                content_spiece_model = self.sp_model.serialized_model_proto()
+                fi.write(content_spiece_model)
 
         return (out_vocab_file,)