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fix "can't convert Errno::EACCES into String" in case of no permission of public/plugin_assets on Ruby 1.9.3. git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.1-stable@10473 e93f8b46-1217-0410-a6f0-8f06a7374b81