resource/aws_emr_cluster: Prevent crash with missing StateChangeReason

[bflad]

Fixes #4164

Tests

13 tests passed (all tests)
=== RUN   TestAccAWSEMRCluster_bootstrap_ordering
--- PASS: TestAccAWSEMRCluster_bootstrap_ordering (469.33s)
=== RUN   TestAccAWSEMRCluster_terminationProtected
--- PASS: TestAccAWSEMRCluster_terminationProtected (475.55s)
=== RUN   TestAccAWSEMRCluster_security_config
--- PASS: TestAccAWSEMRCluster_security_config (486.26s)
=== RUN   TestAccAWSEMRCluster_Step_Multiple
--- PASS: TestAccAWSEMRCluster_Step_Multiple (491.98s)
=== RUN   TestAccAWSEMRCluster_Kerberos_ClusterDedicatedKdc
--- PASS: TestAccAWSEMRCluster_Kerberos_ClusterDedicatedKdc (499.33s)
=== RUN   TestAccAWSEMRCluster_basic
--- PASS: TestAccAWSEMRCluster_basic (527.11s)
=== RUN   TestAccAWSEMRCluster_Step_Basic
--- PASS: TestAccAWSEMRCluster_Step_Basic (586.03s)
=== RUN   TestAccAWSEMRCluster_instance_group
--- PASS: TestAccAWSEMRCluster_instance_group (619.21s)
=== RUN   TestAccAWSEMRCluster_custom_ami_id
--- PASS: TestAccAWSEMRCluster_custom_ami_id (639.96s)
=== RUN   TestAccAWSEMRCluster_s3Logging
--- PASS: TestAccAWSEMRCluster_s3Logging (651.75s)
=== RUN   TestAccAWSEMRCluster_visibleToAllUsers
--- PASS: TestAccAWSEMRCluster_visibleToAllUsers (871.67s)
=== RUN   TestAccAWSEMRCluster_tags
--- PASS: TestAccAWSEMRCluster_tags (948.41s)
=== RUN   TestAccAWSEMRCluster_root_volume_size
--- PASS: TestAccAWSEMRCluster_root_volume_size (989.54s)

[katbyte]

LGTM 👍

[bflad]

This has been released in version 1.14.1 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

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