Geo::RenameRepositoryWorker: NoMethodError: undefined method `date' for nil:NilClass

https://sentry.gitlap.com/gitlab/gitlabcom/issues/485181/

NoMethodError: undefined method `date' for nil:NilClass
  gitlab/gitaly_client/ref_service.rb:287:in `commit_from_local_branches_response'
    authored_date: Time.at(response.commit_author.date.seconds),
  gitlab/gitaly_client/ref_service.rb:238:in `block (2 levels) in consume_find_local_branches_response'
    commit_from_local_branches_response(gitaly_branch)
  gitlab/gitaly_client/ref_service.rb:233:in `each'
    message.branches.map do |gitaly_branch|
  gitlab/gitaly_client/ref_service.rb:233:in `collect'
    message.branches.map do |gitaly_branch|
  gitlab/gitaly_client/ref_service.rb:233:in `block in consume_find_local_branches_response'
    message.branches.map do |gitaly_branch|
...
(66 additional frame(s) were not displayed)

undefined method `date' for nil:NilClass