UnboundLocalError

[spacecake]

Hello,

Good idea and looks promising unfortunately I was unable to test it. I followed the setup guide.
I am unsure where and when to define .env file with the APIs in the local vs docker, but I degrees.
I receive this error on both version: the local run and docker after submitting an attachment.

Error is the same: UnboundLocalError

`UnboundLocalError
UnboundLocalError: cannot access local variable 'mail_data' where it is not associated with a value

Traceback (most recent call last)
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 1498, in call
return self.wsgi_app(environ, start_response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 1476, in wsgi_app
response = self.handle_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 1473, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 882, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 880, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/.local/lib/python3.12/site-packages/flask/app.py", line 865, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/luser/tools/MailHeaderDetective/mhd/server.py", line 234, in index
n = HeaderParser().parsestr(mail_data)
^^^^^^^^^
UnboundLocalError: cannot access local variable 'mail_data' where it is not associated with a value
The debugger caught an exception in your WSGI application. You can now look at the traceback which led to the error.
To switch between the interactive traceback and the plaintext one, you can click on the "Traceback" headline. From the text traceback you can also create a paste of it. For code execution mouse-over the frame you want to debug and click on the console icon on the right side.

You can execute arbitrary Python code in the stack frames and there are some extra helpers available for introspection:

dump() shows all variables in the frame
dump(obj) dumps all that's known about the object`

Any idea?