Empty commits cause build failures

[elijahe]

Orb version:

1.0.0

What happened:

When using a path-filtering configuration without a single continue_config.yml file an empty commit (e.g. git commit --allow-empty -m "[deploy-test] test deploy") causes a build failure. The build fails with the following message:

Checking For yq + CURL
Config list ===
.circleci/continue_config.yml
Generated YAML ===
Error: open .circleci/continue_config.yml: no such file or directory

Exited with code exit status 123

Sample circleci config which can be used to recreate the issue along with an empty commit:

---
version: 2.1

setup: true

orbs:
  path-filtering: circleci/[email protected]

workflows:
  generate-config:
    jobs:
      - path-filtering/filter:
          base-revision: << pipeline.git.branch >>
          mapping: |
            be/.* build-be true be/.circleci/config.yml
            fe/.* build-fe true fe/.circleci/config.yml
            .* build-root true .circleci/root_level_config.yml

Expected behavior:

The build should not fail. Ideally, any catch-all path filtering configs (e.g. .*) should also run.