data-source/aws_launch_template: Fix empty delete_on_termination regression

[jalaziz]

This fixes a regression introduced with #8612. With that change, the aws_launch_template data source broke when an ENI is set.

This is similar to #12936.

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Release note for CHANGELOG:

BUG FIXES:
* data-source/aws_launch_template: Fix error when ENI delete_on_termination is empty

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSLaunchTemplateDataSource_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSLaunchTemplateDataSource_ -timeout 120m
=== RUN   TestAccAWSLaunchTemplateDataSource_basic
=== PAUSE TestAccAWSLaunchTemplateDataSource_basic
=== RUN   TestAccAWSLaunchTemplateDataSource_filter_basic
=== PAUSE TestAccAWSLaunchTemplateDataSource_filter_basic
=== RUN   TestAccAWSLaunchTemplateDataSource_filter_tags
=== PAUSE TestAccAWSLaunchTemplateDataSource_filter_tags
=== RUN   TestAccAWSLaunchTemplateDataSource_metadataOptions
=== PAUSE TestAccAWSLaunchTemplateDataSource_metadataOptions
=== RUN   TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress
=== PAUSE TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress
=== RUN   TestAccAWSLaunchTemplateDataSource_deleteOnTermination
=== PAUSE TestAccAWSLaunchTemplateDataSource_deleteOnTermination
=== RUN   TestAccAWSLaunchTemplateDataSource_NonExistent
=== PAUSE TestAccAWSLaunchTemplateDataSource_NonExistent
=== CONT  TestAccAWSLaunchTemplateDataSource_basic
=== CONT  TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress
=== CONT  TestAccAWSLaunchTemplateDataSource_NonExistent
=== CONT  TestAccAWSLaunchTemplateDataSource_deleteOnTermination
=== CONT  TestAccAWSLaunchTemplateDataSource_filter_tags
=== CONT  TestAccAWSLaunchTemplateDataSource_metadataOptions
=== CONT  TestAccAWSLaunchTemplateDataSource_filter_basic
--- PASS: TestAccAWSLaunchTemplateDataSource_NonExistent (4.38s)
--- PASS: TestAccAWSLaunchTemplateDataSource_metadataOptions (25.17s)
--- PASS: TestAccAWSLaunchTemplateDataSource_basic (25.86s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_tags (26.00s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_basic (26.11s)
--- PASS: TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress (58.57s)
--- PASS: TestAccAWSLaunchTemplateDataSource_deleteOnTermination (58.63s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	60.246s

[jalaziz]

Closing as this landed in a later PR. #14599

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!