Pipeline schedules fail to load if the "owner" account gets deleted

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Summary

Pipeline schedules fail to load if the "owner" account gets deleted

Steps to reproduce

On GitLab.com, or on a self-managed instance with the pipeline_schedules_vue feature flag enabled.

• Create a pipeline schedule in a project as a regular user.
• Load the pipeline schedules page. Observe we can see the schedules.
• Delete the User account.
• Load the pipeline schedules page. Observe the error There was a problem fetching pipeline schedules.
• Also look at the graphql query made when loading the pipeline schedules. We should see the following:

"errors": [
    {
        "message": "Cannot return null for non-nullable field PipelineSchedule.owner"
    }
]

What is the current bug behavior?

Unable to view pipeline schedules when the account of an owner of a pipeline is deleted.

What is the expected correct behavior?

Pipeline schedules should be viewable without errors.

Relevant logs and/or screenshots

With `pipeline_schedules_vue` feature flag enabled on 16.1

With `pipeline_schedules_vue` feature flag disabled on 16.1

Output of checks

This bug happens on GitLab.com -- Feature flag has been enabled on SaaS: [Feature flag] Rollout of `pipeline_schedules_vue` (#375139 - closed)

Workaround

Use the Pipeline schedules API to find the schedules that have a null owner, and delete the schedules using the API or take ownership of the schedule.

Possible fixes