I wanted to share that I came across this issue as well. I was receiving an empty terraform.tfstate file after deploying to a workspace, and was not able to "run". After noticing the "resources": [] was empty in the terraform file (like your code), I thought maybe the resources file could not be found; I was right.

With this line of code in the databricks.yaml file, it was referencing ".yml" files, but my resources file had a ".yaml" file extension instead:

include:
  - ./resources/*.yml

In the resources folder: "setup_jobs.yaml"

I changed the file extension, and got the deployment terraform code to find the file, and now deploys/runs properly.

I hope that helps.