Fix Deployment::StatusUpdateError when transitioning status with empty commit SHA

Summary

A Deployment::StatusUpdateError is occurring in production when attempting to transition a deployment status from :created to :succeed via the API endpoint /api/v4/projects/:id/deployments.

Error Details

Link to the error on Sentry.

Deployment::StatusUpdateError
 
/api/v4/projects/:id/deployments

Cannot transition status via :succeed from :created (Reason(s): Sha The commit does not exist) (Deployment::StatusUpdateError)