Fix challenge file arg support

keydive/cdm.py

@@ -86,12 +86,12 @@ class Cdm:
         Args:
             data (Union[Path, bytes]): The challenge data as a file path or bytes.
         """
-        try:
         if isinstance(data, Path):
             if not data.is_file():
                 raise FileNotFoundError(data)
             data = data.read_bytes()
 
+        try:
             signed_message = SignedMessage()
             signed_message.ParseFromString(data)