Interpret Null UserIdentityToken as Anonymous during ActivateSession #1173
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OPC-UA specification Part 4, 5.6.3 specifies that a Null or empty user token shall always be interpreted as anonymous. Add a test for this case and a fix to properly handle it.
I have a client that uses a Null token when connecting that is refused by the server. I don't know if the empty case would be different.
I'm not sure if the fix should remain in
internal_session.py
or move somewhere in the parser or accepted tokens, feel free to point me toward a more suitable place if needed.