Key with missing value in provider block causes Panic

[Waterdrips]

Terraform Version

Terraform v0.12.0

Terraform Configuration Files

provider "aws" {
  region = var.aws_region
  version = 
}

Debug Output

Crash Output

https://gist.github.com/Waterdrips/31e3289ee717383b1ac0fc8cf8eac41d

Expected Behavior

Error message from TF telling me that theres a missing value

Actual Behavior

Crash

Steps to Reproduce

any of init/plan/apply with the above provider

Additional Context

Couldn't find an existing issue for this - if there is one then sorry!

References

[ghost]

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