provider/aws: Fix error parsing JSON in S3 bucket policy

[kjmkznr]

Specific empty string into S3 bucket policy, cause following error.

Error parsing JSON: unexpected end of JSON input

• template

resource "aws_s3_bucket" "bucket" {
    bucket = "tf-test-bucket"
    policy = ""
}

This commit change output following:

Before:

"" -> "Error parsing JSON: unexpected end of JSON input"

After:

"" -> ""

[jen20]

Hi @kjmkznr - thanks for opening this pull request! It looks good to me and the test coverage is good, but you could squash the commits into one and rebase onto master, then force push back to your branch? Thanks!

[kjmkznr]

Thanks reply.
I squashed commits!

[ghost]

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