Toshi MARUYAMA f01dc24877 Rails3: replace deprecated Errors#on to Errors#[] at app/models/mail_handler.rb
On Rails2, Errors#[] returns single error if one error raises.
But, on Rails3, Errors#[] always returns the array.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8520 e93f8b46-1217-0410-a6f0-8f06a7374b81
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