Merge pull request #31772 from sklirg/fix/31407-redshift-data-source-panic-during-modify

fix(redshift): Nil-check before reading from Endpoint

Author: ewbankkit

.changelog/31772.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+data-source/aws_redshift_cluster: Fix crash reading clusters in `modifying` state
+```

internal/service/redshift/cluster_data_source.go

@@ -255,6 +255,7 @@ func dataSourceClusterRead(ctx context.Context, d *schema.ResourceData, meta int
 
 	if rsc.Endpoint != nil {
 		d.Set("endpoint", rsc.Endpoint.Address)
+		d.Set("port", rsc.Endpoint.Port)
 	}
 
 	d.Set("enhanced_vpc_routing", rsc.EnhancedVpcRouting)
@@ -269,7 +270,6 @@ func dataSourceClusterRead(ctx context.Context, d *schema.ResourceData, meta int
 	d.Set("master_username", rsc.MasterUsername)
 	d.Set("node_type", rsc.NodeType)
 	d.Set("number_of_nodes", rsc.NumberOfNodes)
-	d.Set("port", rsc.Endpoint.Port)
 	d.Set("preferred_maintenance_window", rsc.PreferredMaintenanceWindow)
 	d.Set("publicly_accessible", rsc.PubliclyAccessible)
 	d.Set("default_iam_role_arn", rsc.DefaultIamRoleArn)