Impossible to merge (apply) when 0 projects where planned and disable-apply-all is used

[rickard-von-essen]

• Atlantis version: 0.15.1

Steps to reproduce

1. Run Atlantis with --disable-apply-all
2. Use multiple projects.
3. In GitHub, require that atlantis/plan and atlantis/apply succeeds before auto-merging.
4. Make a change to a file (say README.md) affecting zero projects and open a PR.

Now it's not possible to get this merge since I can't:

• Run atlantis apply - it will result in:

Error: Running atlantis apply without flags is disabled. You must specify which project to apply via the -d

, -w or -p flags.

• Run atlantis apply -p <project name> etc (since there is no valid project names to supply)

The only workaround is to ask a repo owner to temporarily disable the requiring atlantis/apply and manually merge the PR.

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Example:

[nishkrishnan]

This should be solved by: #1323