Identity: check NextSigningKey existence during key rotation #13298
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Description
Fix a panic in the OIDC key rotation due to a missing nil check.
Fixes: #13223
Background
Vault 1.9 introduced a feature to pre-publish signing keys. When keys are generated in Vault 1.8 and rotated with Vault 1.9 a panic will occur due to a missing nil check.
To reproduce the issue: