Unable to create an instance without any IAM role

[tchwpkgorg]

Describe the Bug

When using terraform aws_instance or AWS web GUI, it is possible to launch an instance which doesn't have any IAM role attached.
It seems to me that it's not possible to launch an instance without any IAM role when using cloudposse/ec2-instance/aws.

Expected Behavior

IAM role for an instance should not be created when not wanted nor needed.

Steps to Reproduce

It should be possible to set "instance_profile" to a value which does not create and attach an IAM role.

Screenshots

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Environment

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Additional Context

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