Pipeline status shows a skipped status when only a manual action is available.

Summary

Steps to reproduce

Use the following .gitlab-ci.yml template

image: alpine:latest

stages:
  - release

release_job:
  stage: release
  script:
    - echo 'Release Complete.'
  when: manual

Example Project

https://gitlab.com/dimitrieh/test-skipped-commit-status-with-manual-action/commits/master

What is the current bug behavior?

Shows the pipeline status as skipped even though the only job included is a manual action.

What is the expected correct behavior?

The pipeline status should reflect the manual action status.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)