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NoMethodError: undefined method `gsub' for nil:NilClass

https://sentry.gitlab.net/gitlab/staginggitlabcom/issues/1170306/

NoMethodError: undefined method `gsub' for nil:NilClass
  gitlab/background_migration/migrate_fingerprint_sha256_within_keys.rb:51:in `generate_ssh_public_key'
    Gitlab::SSHPublicKey.new(regular_key).fingerprint("SHA256").gsub("SHA256:", "")
  gitlab/background_migration/migrate_fingerprint_sha256_within_keys.rb:27:in `block (2 levels) in perform'
    fingerprint = Base64.decode64(generate_ssh_public_key(regular_key.key))
  active_record/relation/batches.rb:70:in `block (2 levels) in find_each'
    records.each { |record| yield record }
  active_record/relation/batches.rb:70:in `each'
    records.each { |record| yield record }
  active_record/relation/batches.rb:70:in `block in find_each'
    records.each { |record| yield record }
...
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undefined method `gsub' for nil:NilClass
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