fix: a unexpected token

[Dog-Egg]

I found a bug while using the automated testing tool.

curl -X GET -H 'Authorization: Bearer ,,0' http://localhost:5000/myapi

This request caused an exception.

ERROR    app:app.py:875 Exception on /myapi [GET]
Traceback (most recent call last):
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask/app.py", line 1511, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask/app.py", line 919, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask/app.py", line 917, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask/app.py", line 902, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask_jwt_extended/view_decorators.py", line 167, in decorator
    verify_jwt_in_request(
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask_jwt_extended/view_decorators.py", line 94, in verify_jwt_in_request
    jwt_data, jwt_header, jwt_location = _decode_jwt_from_request(
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask_jwt_extended/view_decorators.py", line 340, in _decode_jwt_from_request
    encoded_token, csrf_token = get_encoded_token_function()
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/lee/workspace/oneproject-logo/.venv/lib/python3.12/site-packages/flask_jwt_extended/view_decorators.py", line 206, in _decode_jwt_from_headers
    jwt_headers = [s for s in field_values if s.split()[0] == header_type]
                                              ~~~~~~~~~^^^
IndexError: list index out of range