py : fix except (ggml-org#5194)

ggerganov · jordankanter · commit 677710f1467d · 2024-02-02T22:08:09.000-06:00
ggml-ci
diff --git a/convert.py b/convert.py
@@ -336,7 +336,7 @@ def __init__(self, fname_tokenizer: Path, fname_added_tokens: Path | None) -> No
         self.bpe_tokenizer = json.loads(open(str(fname_tokenizer), encoding="utf-8").read())
         try:
             self.vocab = self.bpe_tokenizer["model"]["vocab"]
-        except:
+        except KeyError:
             self.vocab = self.bpe_tokenizer
         added_tokens: dict[str, int]
         if fname_added_tokens is not None:
