Works around FileUtils.rmdir issue in 1.9.2

lib/paperclip/storage/filesystem.rb

@@ -56,6 +56,7 @@ module Paperclip
             while(true)
               path = File.dirname(path)
               FileUtils.rmdir(path)
+              break if File.exists?(path) # Ruby 1.9.2 does not raise if the removal failed.
             end
           rescue Errno::EEXIST, Errno::ENOTEMPTY, Errno::ENOENT, Errno::EINVAL, Errno::ENOTDIR
             # Stop trying to remove parent directories