NoMethodError: undefined method `local?' for nil:NilClass

https://sentry.gitlab.net/gitlab/gitlabcom/issues/934131/

NoMethodError: undefined method `local?' for nil:NilClass
  gitlab/import_export/command_line_util.rb:25:in `download_or_copy_upload'
    if uploader.upload.local?
  gitlab/import_export/file_importer.rb:65:in `copy_archive'
    download_or_copy_upload(@project.import_export_upload.import_file, @archive_file)
  gitlab/import_export/file_importer.rb:26:in `import'
    copy_archive
  gitlab/import_export/file_importer.rb:12:in `import'
    new(*args).import
  gitlab/import_export/importer.rb:40:in `import_file'
    Gitlab::ImportExport::FileImporter.import(project: @project,
...
(68 additional frame(s) were not displayed)

NoMethodError: undefined method `local?' for nil:NilClass