Fails to create EC2 when ami variable is defined

[Zonny]

Hello,

I am recently trying to use this module and ran into this issue

 Error: Missing required argument
 
   with module.mattermost_standalone_ecs_instance.aws_instance.this[0],
   on .terraform/modules/mattermost_standalone_ecs_instance/main.tf line 22, in resource "aws_instance" "this":
   22:   ami                  = try(coalesce(var.ami, nonsensitive(data.aws_ssm_parameter.this[0].value)), null)
 
 "ami": one of `ami,launch_template` must be specified

It seems like it might be due to merging this PR. The reason I believe is that the ami variable is always getting set to null because data.aws_ssm_parameter.this[0].value cannot be referenced. I removed the try block locally and get this error message

 Error: Invalid index
 
   on .terraform/modules/mattermost_standalone_ecs_instance/main.tf line 22, in resource "aws_instance" "this":
   22:   ami                  = coalesce(var.ami, nonsensitive(data.aws_ssm_parameter.this[0].value))
     ├────────────────
     │ data.aws_ssm_parameter.this is empty tuple
 
 The given key does not identify an element in this collection value: the collection has no elements.

I opened up a PR to address the issue. Let me know if it is acceptable or if changes will need to be required

Originally posted by @Zonny in #351 (comment)

[JoaoJanini]

Same problem here. Had to pass the ami using ami_ssm_parameter instead of ami as a workaround.

[antonbabenko]

This issue has been resolved in version 5.3.1 🎉

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