If unset, env var `ATLANTIS_DATA_DIR` is empty even though there is a default

[nitrocode]

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Overview of the Issue

The ATLANTIS_DATA_DIR should default to /home/atlantis/.atlantis as per the FAQ

https://www.runatlantis.io/docs/faq

Atlantis, by default, stores all locking and Terraform plans locally on disk under the --data-dir directory (defaults to ~/.atlantis).

This becomes an issue if the value is unset if you have yaml configuration file that references the env var instead of the hard coded value.

The workaround is to always set the value so it can be references in the workflows yaml configs.

Reproduction Steps

Use ATLANTIS_DATA_DIR without setting it and it will throw an error because the env var is empty.

Logs

N/A

Environment details

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Additional Context

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