added nil check for nfs exports

[awsaxeman]

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Closes #22475

Output from acceptance testing:

$ make testacc TESTS=TestAccFSxOpenzfsFileSystem_rootVolume PKG=fsx
=== RUN   TestAccFSxOpenzfsFileSystem_rootVolume
=== PAUSE TestAccFSxOpenzfsFileSystem_rootVolume
=== CONT  TestAccFSxOpenzfsFileSystem_rootVolume
--- PASS: TestAccFSxOpenzfsFileSystem_rootVolume (1409.91s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/fsx        1414.120s
...

[awsaxeman]

Seems problem is nfs exports returns an array with a single Null value instead just an overall Null. When iterator reaches first value it tries to read property of the null.

Add check to the loop to check if each item is a null and skip if it is.

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccFSxOpenzfsFileSystem_rootVolume PKG=fsx
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/fsx/... -v -count 1 -parallel 20 -run='TestAccFSxOpenzfsFileSystem_rootVolume' -timeout 180m
=== RUN   TestAccFSxOpenzfsFileSystem_rootVolume
=== PAUSE TestAccFSxOpenzfsFileSystem_rootVolume
=== CONT  TestAccFSxOpenzfsFileSystem_rootVolume
--- PASS: TestAccFSxOpenzfsFileSystem_rootVolume (1423.10s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/fsx	1426.744s

[ewbankkit]

@awsaxeman Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v3.72.0 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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