fix: user registration through IdP

[livio-a]

fixes a nil pointer panic (introduced with #7815), which occurred after a user was registered through an IdP.
While checking the logs, further panics were discovered and fixed in this PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@83c5066). Click here to learn what that means.

Files	Patch %	Lines
internal/command/user_human.go	0.00%	5 Missing ⚠️
internal/api/ui/login/init_user_handler.go	0.00%	3 Missing ⚠️
internal/api/ui/login/mfa_verify_otp_handler.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7893   +/-   ##
=======================================
  Coverage        ?   63.01%           
=======================================
  Files           ?     1333           
  Lines           ?   110084           
  Branches        ?        0           
=======================================
  Hits            ?    69370           
  Misses          ?    36772           
  Partials        ?     3942           

Flag	Coverage Δ
core-integration-tests-postgres	63.01% <0.00%> (?)

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[github-actions]

🎉 This PR is included in version 2.51.1 🎉

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