Tails Greeter 0.8.2+jessie cannot log in

I can’t log in with the Greeter in a current build from feature/jessie. In the journal, I see a Python traceback about a NotImplementedError exception being thrown in gdmclient.py, at line 65. If I got it right, this means that __on_secret_info_query is called, while we don’t expect it to be.

Parent Task: #7561 (closed)

Original created by @intrigeri on 7673 (Redmine)

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