config: detect provisioner-only resource in JSON and error [GH-4385] #4746
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Fixes #4385
This detects when a very specific kind of JSON config is input to Terraform and shows an error. A potentially better fix would be to modify the HCL AST in Terraform and transform it to the correct one. This would be a lot of effort compared to this when there is a very easy workaround.
I didn't test this since the test case would have to test the error string itself which I don't like, and otherwise with without this fix you get an error, this just improves the error message.