fix error handling in cb.py

[paul-l1]

closes #377

[djs0109]

@paul-l1 Thanks for the quick fix! Could you please provide a minimal example to reproduce the error that you had? Specifically, I would like to know when the err.response is None will be True , because this could also be a general issue for other clients in filip

[paul-l1]

@paul-l1 Thanks for the quick fix! Could you please provide a minimal example to reproduce the error that you had? Specifically, I would like to know when the err.response is None will be True , because this could also be a general issue for other clients in filip

The err.response can be None for many reasons. In my case it was an SSLError, which could be reproduced like raise requests.exceptions.SSLError("test"). There are other possible errors like requests.exceptions.ConnectionError, requests.exceptions.Timeout, requests.exceptions.InvalidURL. Those errors can be caused by problems with network connection or certificate verification failures.

[djs0109]

@paul-l1 I move the PR here #382 to activate the CI/CD workflow