ActionView::Template::Error: undefined method `last_deployment' for nil:NilClass

https://sentry.gitlap.com/gitlab/gitlabcom/issues/15107/

NoMethodError: undefined method `last_deployment' for nil:NilClass
  app/views/projects/builds/show.html.haml:49:in `_app_views_projects_builds_show_html_haml__1928520620939811846_69987207762200'
    - if environment.last_deployment
  app/controllers/projects/builds_controller.rb:35:in `show'
    respond_to do |format|
  lib/gitlab/request_profiler/middleware.rb:15:in `call'
    @app.call(env)
  lib/gitlab/middleware/rails_queue_duration.rb:20:in `call'
    @app.call(env)
  lib/gitlab/metrics/rack_middleware.rb:29:in `block in call'
    retval = trans.run { @app.call(env) }
...
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ActionView::Template::Error: undefined method `last_deployment' for nil:NilClass