$ p cap deploy:patch commit=4317449afa6ee2be0f46f635da62a7651458a9af
  * executing `deploy:patch'
./config/deploy/web.rb:125:in `+': can't convert nil into Array (TypeError)
        from ./config/deploy/web.rb:125:in `load'
        from ./config/deploy/web.rb:124:in `each'
        from ./config/deploy/web.rb:124:in `load'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/configuration/execution.rb:80:in `instance_eval'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/configuration/execution.rb:80:in `execute_task_without_callbacks'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/configuration/callbacks.rb:27:in `execute_task'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/configuration/execution.rb:92:in `find_and_execute_task'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/execute.rb:43:in `execute_requested_actions_without_help'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/execute.rb:42:in `each'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/execute.rb:42:in `execute_requested_actions_without_help'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/help.rb:19:in `execute_requested_actions'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/execute.rb:31:in `execute!'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/lib/capistrano/cli/execute.rb:14:in `execute'
        from /var/lib/gems/1.8/gems/capistrano-2.2.0/bin/cap:4
        from /var/lib/gems/1.8/bin//cap:19:in `load'
        from /var/lib/gems/1.8/bin//cap:19