Werk #11756: Fix errors after form submissions when using web server authentication

Component	GUI
Title	Fix errors after form submissions when using web server authentication
Date	Dec 8, 2020
Checkmk Editon	Checkmk Raw (CRE)
Checkmk Version	2.1.0i1 2.0.0b2
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed

When using the web server level authentication (Basic, digest, kerberos, ...), several form submissions raised an error like this: "AttributeError ('NoneType' object has no attribute 'session_info')". This was caused by an incomplete session initialization when using this kind of authentication.

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