fix(op): omit empty state from code flow redirect

[muhlemmer]

Add test cases to reproduce the original bug, and it's resolution.

closes #415

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• Critical parts are tested automatically
• [ x Where possible E2E tests are implemented
• Documentation/examples are up-to-date
• All non-functional requirements are met
• Functionality of the acceptance criteria is checked manually on the dev system.

[codecov]

Codecov Report

Merging #428 (11fef51) into main (45582b6) will increase coverage by 0.61%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #428      +/-   ##
==========================================
+ Coverage   52.69%   53.31%   +0.61%     
==========================================
  Files          74       74              
  Lines        5725     5725              
==========================================
+ Hits         3017     3052      +35     
+ Misses       2446     2414      -32     
+ Partials      262      259       -3     

Files Changed	Coverage Δ
pkg/op/auth_request.go	57.54% <100.00%> (+1.79%)	⬆️

... and 3 files with indirect coverage changes

[github-actions]

🎉 This PR is included in version 2.8.1 🎉

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