r/aws_msk_cluster: Fix crash when tls configuration block is empty

[ewbankkit]

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Closes #24881.

--- PASS: TestAccKafkaCluster_basic (1834.32s)
=== CONT  TestAccKafkaCluster_Info_revision
--- PASS: TestAccKafkaCluster_EncryptionInfo_encryptionAtRestKMSKeyARN (1834.56s)
=== CONT  TestAccKafkaCluster_ClientAuthenticationTLS_initiallyNoAuthentication
--- PASS: TestAccKafkaCluster_ClientAuthenticationSASL_scram (3776.23s)
=== CONT  TestAccKafkaCluster_ClientAuthenticationTLS_certificateAuthorityARNs
--- PASS: TestAccKafkaCluster_Info_revision (2719.22s)
=== CONT  TestAccKafkaCluster_ClientAuthenticationSASL_iam
--- PASS: TestAccKafkaCluster_ClientAuthenticationTLS_certificateAuthorityARNs (1685.06s)
=== CONT  TestAccKafkaCluster_loggingInfo
--- PASS: TestAccKafkaCluster_ClientAuthenticationTLS_initiallyNoAuthentication (4127.46s)
=== CONT  TestAccKafkaCluster_tags
--- PASS: TestAccKafkaCluster_tags (1579.31s)
=== CONT  TestAccKafkaCluster_kafkaVersionUpgradeWithInfo
--- PASS: TestAccKafkaCluster_loggingInfo (2236.75s)
=== CONT  TestAccKafkaCluster_kafkaVersionDowngrade
--- PASS: TestAccKafkaCluster_ClientAuthenticationSASL_iam (3860.76s)
=== CONT  TestAccKafkaCluster_kafkaVersionUpgrade
--- PASS: TestAccKafkaCluster_kafkaVersionDowngrade (3363.53s)
=== CONT  TestAccKafkaCluster_enhancedMonitoring
--- PASS: TestAccKafkaCluster_enhancedMonitoring (1907.71s)
=== CONT  TestAccKafkaCluster_openMonitoring
--- PASS: TestAccKafkaCluster_kafkaVersionUpgradeWithInfo (5716.31s)
=== CONT  TestAccKafkaCluster_numberOfBrokerNodes
--- PASS: TestAccKafkaCluster_kafkaVersionUpgrade (6208.73s)
=== CONT  TestAccKafkaCluster_BrokerNodeGroupInfo_modifyEBSVolumeSizeToStorageInfo
--- PASS: TestAccKafkaCluster_openMonitoring (1816.06s)
=== CONT  TestAccKafkaCluster_BrokerNodeGroupInfo_publicAccessSASLIAM
--- PASS: TestAccKafkaCluster_numberOfBrokerNodes (2236.92s)
=== CONT  TestAccKafkaCluster_BrokerNodeGroupInfo_storageInfo
--- PASS: TestAccKafkaCluster_BrokerNodeGroupInfo_storageInfo (2196.94s)
=== CONT  TestAccKafkaCluster_BrokerNodeGroupInfo_instanceType
--- PASS: TestAccKafkaCluster_BrokerNodeGroupInfo_modifyEBSVolumeSizeToStorageInfo (4788.81s)
=== CONT  TestAccKafkaCluster_EncryptionInfoEncryptionInTransit_inCluster
--- PASS: TestAccKafkaCluster_EncryptionInfoEncryptionInTransit_inCluster (1886.54s)
=== CONT  TestAccKafkaCluster_EncryptionInfoEncryptionInTransit_clientBroker
--- PASS: TestAccKafkaCluster_BrokerNodeGroupInfo_publicAccessSASLIAM (6606.06s)

[github-actions]

This functionality has been released in v4.16.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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