cmd/fmt: Avoid removing quotes from empty labels

[radeksimko]

Terraform Version

0.14.0-beta2

Terraform Configuration Files

provider "" {
}

Expected Behavior

fmt to leave the code as is.

Actual Behavior

fmt removed quotes and therefore removed the empty label.

Steps to Reproduce

v0.13

$ echo "provider \"\" {\n}\n" | terraform fmt -

provider "" {
}

v0.14

$ echo "provider \"\" {\n}\n" | terraform fmt -

provider {
}

[alisdair]

Confirmed, thanks! Upstream fix is here: hashicorp/hcl#422

[ghost]

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