* set `krbPrincipalAttribute` to `''` if unset in kc before and after responses
* add changelog fragment
* Update changelogs/fragments/8785-keycloak_user_federation-set-krbPrincipalAttribute-to-empty-string-if-missing.yaml
Co-authored-by: Felix Fontein <felix@fontein.de>
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Co-authored-by: Felix Fontein <felix@fontein.de>