When updating from 5.1 to 5.2: Backup is failing if you never uploaded a file via the GUI.

Created by: brototyp

Dumping uploads ... 
rake aborted!
No such file or directory - /home/git/gitlab/public/uploads
/home/git/gitlab/lib/backup/uploads.rb:14:in `dump'
/home/git/gitlab/lib/tasks/gitlab/backup.rake:147:in `block (4 levels) in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/home/git/gitlab/lib/tasks/gitlab/backup.rake:12:in `block (3 levels) in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/home/git/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
Tasks: TOP => gitlab:backup:uploads:create
(See full trace by running task with --trace)