connector helper get config variable ValueError is almost unreachable.

[flavienSindou]

https://github.com/OpenCTI-Platform/client-python/blob/34b4975c9c3eb356dcb79e1803e325d460fb454f/pycti/connector/opencti_connector_helper.py#L70C5-L87C17

The only way the value error is raised is :
We use env variable,
The ENV Var DOES EXIST.
and is an empty string

But not in other cases.

[nino-filigran]

@flavienSindou I'm not sure to understnad: what is the impact of this?